Re: Python Book for a C Programmer?
Am 24.05.2012 01:45, schrieb hsa...@gmail.com: > I am trying to join an online class that uses python. I need to brush > up on the language quickly. Is there a good book or resource that > covers it well but does not have to explain what an if..then..else > statement is? First thing to check first is whether the online course uses Python 2 or Python 3. For Python 2, try starting at docs.python.org. There you will find library documentation, language specifications and also tutorials. Uli -- http://mail.python.org/mailman/listinfo/python-list
Re: Wish: Allow all log Handlers to accept the level argument
Fayaz Yusuf Khan wrote:
> ***TRIVIAL ISSUE***, but this has been irking me for a while now.
> The main logging.Handler class' __init__ accepts a level argument while
> none of its children do. The poor minions seem to be stuck with the
> setLevel method which considerably lengthens the code.
>
> In short:
> Let's do this:
> root.addHandler(FileHandler('debug.log', level=DEBUG)
> Instead of this:
> debug_file_handler = FileHandler('debug.log')
> debug_file_handler.setLevel(DEBUG)
> root.addHandler(debug_file_handler)
>
> Python 2.7
Your suggestion comes too late for Python 2 for which only bugfixes are
accepted. For Python 3.3 you could write a patch and make a feature request
on http://bugs.python.org/ .
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Working with dates : complex problem
Hi, I've a list of python objects with dates attributes. This list is ordered by one of these date. Elements mandatory follow each other : Element #1 Element #2 Element #3 |-|--|--| Now, I want to "insert" an element in this timeline. This imply that I will have to resize some elements : Element #1 Element #2 Element #3 |-|--|--| New element |--| And after resize : Element #1 New element Element #2 Element #3 |-|--|-|--| |--| My question is the following : how can I know (easily) which elements my "New element" is "over", which, in my example would have returned ['Element #1', 'Element #2']. Elements objets are simple Python objects with dates : obj.begin = datetime() obj.end = datetime() I'm looking for the more Pythonic way to handle this problem, thanks ! -- http://mail.python.org/mailman/listinfo/python-list
Namespace hack
>From the Zen of Python ("import this"):
Namespaces are one honking great idea -- let's do more of those!
Inspired by this, I have a decorator that abuses function closures to
create a namespace type with the following properties:
- all methods are static methods that do not take a "self" parameter;
- methods can see "class variables";
- external callers can see selected methods and attributes.
An example may make this clearer.
In a regular class:
class C:
x = 42
def spam(self, y):
return self.x + y
def ham(self, z):
return self.spam(z+1)
Notice that the class attribute x is visible to the outside caller, but
methods spam and ham cannot see it except by prefixing it with a
reference to "self".
Here's an example using my namespace hack example:
@namespace
def C(): # Abuse nested functions to make this work.
x = 42
def spam(y):
return x + y
def ham(z):
return spam(z+1)
return (spam, ham) # Need an explicit return to make methods visible.
However, class attribute x is not exposed. You may consider this a
feature, rather than a bug. To expose a class attribute, define it in the
outer function argument list:
@namespace
def C(x=42):
def spam(y):
return x + y
def ham(z):
return spam(z+1)
return (spam, ham)
And in use:
>>> C.x
42
>>> C.spam(100)
142
>>> C.ham(999)
1042
Here's the namespace decorator:
import inspect
def namespace(func):
spec = inspect.getargspec(func)
ns = {'__doc__': func.__doc__}
for name, value in zip(spec.args, spec.defaults or ()):
ns[name] = value
function = type(lambda: None)
exported = func() or ()
try:
len(exported)
except TypeError:
exported = (exported,)
for obj in exported:
if isinstance(obj, function):
ns[obj.__name__] = staticmethod(obj)
else:
raise TypeError('bad export')
Namespace = type(func.__name__, (), ns)
return Namespace()
Have fun!
--
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Re: Working with dates : complex problem
Thibaut DIRLIK wrote: > Hi, > > I've a list of python objects with dates attributes. This list is ordered > by one of these date. Elements mandatory follow each other : > > Element #1 Element #2 Element #3 > |-|--|--| > > Now, I want to "insert" an element in this timeline. This imply that I > will have to resize some elements : > > Element #1 Element #2 Element #3 > |-|--|--| > New element > |--| > > And after resize : > > Element #1 New element Element #2 Element #3 > |-|--|-|--| > > |--| > > My question is the following : how can I know (easily) which elements my > "New element" is "over", which, > in my example would have returned ['Element #1', 'Element #2']. > > Elements objets are simple Python objects with dates : > > obj.begin = datetime() > obj.end = datetime() > > I'm looking for the more Pythonic way to handle this problem, thanks ! Untested: def insert(timeline, interval): keys = [item.begin for item in timeline] where = bisect.bisect(keys, interval.begin) if where > 0: # adjust previous interval to avoid a gap or an intersection timeline[where-1].end = interval.begin # remove intervals covered by the new interval while where < len(timeline) and timeline[where].end < interval.end: del timeline[where] if where < len(timeline): # adjust subsequent interval to avoid gap or intersection timeline[where].begin = interval.end timeline.insert(where, interval) If you implement comparison for your interval type you won't need the intermediate keys list. The functools.total_ordering decorator may help you with that. -- http://mail.python.org/mailman/listinfo/python-list
Re: Korean fonts on Python 2.6 (MacOsX)
Am 23.05.2012 11:30, schrieb 20_feet_tall: > I have a problem with the visualization of korean fonts on Python. > When I try to type in the characters only squares come out. > I have tried to install the CJK codec, the hangul 1.0 codec but still > no result. What exactly do you mean with "visualization"? Python itself doesn't do any visualization, all it does is to manage data. This data can be bytes exchanged with e.g. a terminal window or a file. If the file uses encoding A for some text, but Python interprets the bytes according to encoding B, no good will come of it. Similarly, if the console window expects Python to output one encoding and Python uses a different encoding, bad things happen. Further, but that now has almost nothing to do with Python directly, if the console window tries to render a character that is not contained in the current font, it will fail. The typical behaviour then is to fall back to some placeholder char, like the square you describe. Summary: It's not clear enough what you did, so it's impossible to tell what went wrong. It could also help if you told us what you wanted to achieve. That said, Python 2.7 has been out for a while, and I'd consider upgrading. Uli -- http://mail.python.org/mailman/listinfo/python-list
Re: Wish: Allow all log Handlers to accept the level argument
Fayaz Yusuf Khan wrote:
Jean-Michel Pichavant wrote:
Meanwhile you can shorten the code this way:
root.addHandler(FileHandler('debug.log'))
root.handlers[-1].setLevel(DEBUG)
Eh? Readability was the aim.
I fail to see how it's not readable, code is short and no magic is
involved provided you know about slicing list items. Anyway, to answer
your question on why addHandler do not return the handler, I'll quote
Dave Angel from a recent thread about "why s.append(5) does not return s":
"It's simpler than that. Methods/functions either modify the object (or
one of their arguments), or return the results, but generally not both.
So sorted() returns a sorted list without modifying the input. And the
sort() method modifies the list, but does not return it. So you're
right that methods on non-mutables must return the new value, since they
can't modify the object."
JM
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Re: Wish: Allow all log Handlers to accept the level argument
Jean-Michel Pichavant wrote:
> Fayaz Yusuf Khan wrote:
>> Jean-Michel Pichavant wrote:
>>
>>> Meanwhile you can shorten the code this way:
>>>
>>> root.addHandler(FileHandler('debug.log'))
>>> root.handlers[-1].setLevel(DEBUG)
>>>
>>>
>> Eh? Readability was the aim.
>>
> I fail to see how it's not readable, code is short and no magic is
> involved provided you know about slicing list items. Anyway, to answer
You have to know or verify that .addHandler() appends to the .handlers list,
you have to check if or under which conditions
h = SomeHandler()
root.addHandler(h)
assert h is root.handlers[-1]
can fail. In short, if I see such a hack my trust in the author of that code
is significantly lowered.
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Re: Wish: Allow all log Handlers to accept the level argument
Peter Otten wrote:
Jean-Michel Pichavant wrote:
Fayaz Yusuf Khan wrote:
Jean-Michel Pichavant wrote:
Meanwhile you can shorten the code this way:
root.addHandler(FileHandler('debug.log'))
root.handlers[-1].setLevel(DEBUG)
Eh? Readability was the aim.
I fail to see how it's not readable, code is short and no magic is
involved provided you know about slicing list items. Anyway, to answer
You have to know or verify that .addHandler() appends to the .handlers list,
you have to check if or under which conditions
h = SomeHandler()
root.addHandler(h)
assert h is root.handlers[-1]
can fail. In short, if I see such a hack my trust in the author of that code
is significantly lowered.
I now fail to see how it's a hack. handlers is a public attribute of
loggers.
FYI
def addHandler(self, hdlr):
"""
Add the specified handler to this logger.
"""
if not (hdlr in self.handlers):
self.handlers.append(hdlr)
Cheers,
JM
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Re: Wish: Allow all log Handlers to accept the level argument
Jean-Michel Pichavant wrote:
> Peter Otten wrote:
>> Jean-Michel Pichavant wrote:
>>
>>
>>> Fayaz Yusuf Khan wrote:
>>>
Jean-Michel Pichavant wrote:
> Meanwhile you can shorten the code this way:
>
> root.addHandler(FileHandler('debug.log'))
> root.handlers[-1].setLevel(DEBUG)
>
>
>
Eh? Readability was the aim.
>>> I fail to see how it's not readable, code is short and no magic is
>>> involved provided you know about slicing list items. Anyway, to answer
>>>
>>
>> You have to know or verify that .addHandler() appends to the .handlers
>> list, you have to check if or under which conditions
>>
>> h = SomeHandler()
>> root.addHandler(h)
>> assert h is root.handlers[-1]
>>
>> can fail. In short, if I see such a hack my trust in the author of that
>> code is significantly lowered.
>>
>>
> I now fail to see how it's a hack. handlers is a public attribute of
> loggers.
Can you come up with a setup that makes the above assertion fail? I can
think of three:
- adding a handler twice
- adding a singleton handler
- adding handlers from multiple threads
> FYI
>
> def addHandler(self, hdlr):
> """
> Add the specified handler to this logger.
> """
Subject to change. I think in current Python
> if not (hdlr in self.handlers):
> self.handlers.append(hdlr)
is protected by a lock.
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other languages API to python
Hello, A vendor provided a C, C++ and Java API for a application. They dont support python so I would like to create a library for it. My question is, how hard/easy would it be to create something like this? Is there a simple HOWTO or examples I can follow? Can someone shed home light on this? TIA -- --- Get your facts first, then you can distort them as you please.-- -- http://mail.python.org/mailman/listinfo/python-list
Re: problem loading matlab data with ompc and python
On May 23, 5:10 pm, no1 wrote:
> Hi, we're investigating transitioning our company from matlab to python. We
> found OMPC as a MATLAB m-file-to Python translator, but we're encountering a
> problem using the translated code to import MATLAB data structures into
> Python. For example, when we save data within MATLAB this way:
>
> x.a = 5;
> x.b = 6;
> save -v6 test x
>
> this saves data in test.mat, with MATLAB version 6 compatibility (OMPC says
> it's not compatible with the latest versions of MATLAB). The code to read in
> data in MATLAB is just
>
> load test
>
> and when we run it through OMPC we get
>
> load(mstring('test.mat'))
>
> but when we run it we get the error message
>
> File "ompclib\ompclib_numpy.py", line 1496, in load
> KeyError: "[('a', '|O4'), ('b', '|O4')]"
>
> Reading in simpler data (up to arrays) does not have this problem.
>
> To get other people in the company to transition, we were hoping that the
> translation process could be done in one step or on the fly. We could read in
> MATLAB data using I/O functions imported from scipy, but then the transition
> isn't seamless any more.
>
> Is there a simple fix to using OMPC? Or a similar alternative that would work
> better?
>
> Thanks
Have you tried using loadmat from the scipy.io module?
http://docs.scipy.org/doc/scipy/reference/io.html
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Re: other languages API to python
On Thu, May 24, 2012 at 9:58 PM, Rita wrote: > Hello, > > A vendor provided a C, C++ and Java API for a application. They dont support > python so I would like to create a library for it. My question is, how > hard/easy would it be to create something like this? Is there a simple HOWTO > or examples I can follow? Can someone shed home light on this? The best way would be to write something in C that exposes the API to Python. Check out the docs on "Extending and Embedding Python": For Python 2.x: http://docs.python.org/extending/ For Python 3.x: http://docs.python.org/py3k/extending/ You'll need to learn Python's own API, of course, but if you're a competent C programmer, you should find it fairly straightforward. There's an alternative, too, though I haven't personally used it. The ctypes module allows you to directly call a variety of C-provided functions. http://docs.python.org/library/ctypes.html http://docs.python.org/py3k/library/ctypes.html The resulting code isn't nearly as Pythonic as it could be if you write a proper wrapper, but you save the work of writing C code. Chris Angelico -- http://mail.python.org/mailman/listinfo/python-list
Email Id Verification
Hello everyone.. I am new to asp.net... I want to use Regular Expression validator in Email id verification.. Can anyone tell me how to use this and what is the meaning of this \w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
On Thu, May 24, 2012 at 10:32 PM, niks wrote: > Hello everyone.. > I am new to asp.net... > I want to use Regular Expression validator in Email id verification.. > Can anyone tell me how to use this and what is the meaning of > this > \w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* This is a mailing list about Python, not ASP, and not regular expressions. Every regex library is different, some more than others, so your best bet is to find documentation on the actual function/library you'll be using. But I would strongly recommend NOT using a regex to validate an email address. It's prone to false positives and false negatives. There are, unfortunately, many systems around which do not accept legal addresses (for instance, "this.is.vali...@rosuav.com" is, as the name suggests, quite valid - as is "fred_foobar@[203.214.67.43]"); part of the blame can be laid on PHP's inbuilt validation functions, but I know that several are implemented using a fairly simple and brutally wrong check. Validate the domain part (the bit after the @) with a DNS lookup, nothing more and nothing less. If you absolutely must do a syntactic/charset check, read the appropriate RFCs and figure out what really is and isn't legal. You will be surprised. (For instance, "foo@localhost" is a perfectly valid address, because "localhost" is a top-level domain.) Chris Angelico -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Book for a C Programmer?
On May 23, 2012, at 7:45 PM, hsa...@gmail.com wrote: > I am trying to join an online class that uses python. I need to brush up on > the language quickly. Is there a good book or resource that covers it well > but does not have to explain what an if..then..else statement is? > > Thanks. > -- > http://mail.python.org/mailman/listinfo/python-list My preference is "Python Essential Reference" by Beazley. You can find it and several reviews here: http://www.amazon.com/Python-Essential-Reference-David-Beazley/dp/0672329786/ref=sr_1_1?s=books&ie=UTF8&qid=1337859988&sr=1-1 -Bill -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
On Thu, 24 May 2012 05:32:16 -0700, niks wrote: > Hello everyone.. > I am new to asp.net... > I want to use Regular Expression validator in Email id verification.. > Can anyone tell me how to use this and what is the meaning of this > \w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* this is not really a python question. I would suggest you locate a good regular expression tutorial & then try to break it down otherwise you could try asking in an asp.net forum -- Sometimes when presented with a problem you will think "I know I will use regular expressions" Now you have two problems. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Book for a C Programmer?
On Wed, 23 May 2012 16:45:05 -0700, hsaziz wrote: > I am trying to join an online class that uses python. I need to brush up > on the language quickly. Is there a good book or resource that covers it > well but does not have to explain what an if..then..else statement is? > > Thanks. Dive into python seems to be quite popular & can be read online fro free -- If life gives you lemons, make lemonade. -- http://mail.python.org/mailman/listinfo/python-list
Re: Namespace hack
> >From the Zen of Python ("import this"):
>
> Namespaces are one honking great idea -- let's do more of those!
>
>
> Inspired by this, I have a decorator that abuses function closures to
> create a namespace type with the following properties:
>
> - all methods are static methods that do not take a "self" parameter;
>
> - methods can see "class variables";
>
> - external callers can see selected methods and attributes.
>
>
> An example may make this clearer.
>
> In a regular class:
>
> class C:
> x = 42
> def spam(self, y):
> return self.x + y
> def ham(self, z):
> return self.spam(z+1)
>
>
> Notice that the class attribute x is visible to the outside caller, but
> methods spam and ham cannot see it except by prefixing it with a
> reference to "self".
>
> Here's an example using my namespace hack example:
>
> @namespace
> def C(): # Abuse nested functions to make this work.
> x = 42
> def spam(y):
> return x + y
> def ham(z):
> return spam(z+1)
> return (spam, ham) # Need an explicit return to make methods visible.
>
> However, class attribute x is not exposed. You may consider this a
> feature, rather than a bug. To expose a class attribute, define it in the
> outer function argument list:
>
> @namespace
> def C(x=42):
> def spam(y):
> return x + y
> def ham(z):
> return spam(z+1)
> return (spam, ham)
>
>
>
> And in use:
>
C.x
> 42
C.spam(100)
> 142
C.ham(999)
> 1042
>
>
>
> Here's the namespace decorator:
>
> import inspect
>
> def namespace(func):
> spec = inspect.getargspec(func)
> ns = {'__doc__': func.__doc__}
> for name, value in zip(spec.args, spec.defaults or ()):
> ns[name] = value
> function = type(lambda: None)
> exported = func() or ()
> try:
> len(exported)
> except TypeError:
> exported = (exported,)
> for obj in exported:
> if isinstance(obj, function):
> ns[obj.__name__] = staticmethod(obj)
> else:
> raise TypeError('bad export')
> Namespace = type(func.__name__, (), ns)
> return Namespace()
>
>
> Have fun!
Funny, you got to the last line of "import this" but apparently
skipped the second line:
Explicit is better than implicit.
And you didn't even post your message on April 1 so no, I can't laugh
even though I'd like to.
Cheers,
Daniel
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Re: Python Book for a C Programmer?
On 2012-05-24, alister wrote: > On Wed, 23 May 2012 16:45:05 -0700, hsaziz wrote: > >> I am trying to join an online class that uses python. I need to brush up >> on the language quickly. Is there a good book or resource that covers it >> well but does not have to explain what an if..then..else statement is? >> >> Thanks. > > Dive into python seems to be quite popular & can be read online fro free > > Learning Python by Mark Lutz, from O'Reilly is a good one, I've been reading it and it also enforces a comparison between C programming and Python. However, it's focused on Python 2, but it also mentions Python 3 things in the text... -- Javier Novoa C. --- Posted via news://freenews.netfront.net/ - Complaints to n...@netfront.net --- -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Book for a C Programmer?
On Thu, May 24, 2012 at 8:28 AM, Javier Novoa C. wrote: > On 2012-05-24, alister wrote: >> On Wed, 23 May 2012 16:45:05 -0700, hsaziz wrote: >> >>> I am trying to join an online class that uses python. I need to brush up >>> on the language quickly. Is there a good book or resource that covers it >>> well but does not have to explain what an if..then..else statement is? >>> >>> Thanks. >> >> Dive into python seems to be quite popular & can be read online fro free >> >> > > Learning Python by Mark Lutz, from O'Reilly is a good one, I've been > reading it and it also enforces a comparison between C programming and > Python. However, it's focused on Python 2, but it also mentions Python > 3 things in the text... > There is a new edition out, copyright 2010 if I recall correctly, that updates its coverage to Python 3.x, which is the book's primary focus, though it points out where 3.x syntax does not work in version 2.x. Cheers! boB -- http://mail.python.org/mailman/listinfo/python-list
Dynamic comparison operators
I would like to pass something like this into a function test(val1,val2,'>=') and it should come back with True or False. Is there a way to dynamically compare 2 values like this or will I have to code each operator individually? -- http://mail.python.org/mailman/listinfo/python-list
Re: Dynamic comparison operators
Hello, You can pass an operator as an argument to your function. See : http://docs.python.org/library/operator.html Regards, -- Forwarded message -- From: Date: 2012/5/24 Subject: Dynamic comparison operators To: python-list@python.org I would like to pass something like this into a function test(val1,val2,'>=') and it should come back with True or False. Is there a way to dynamically compare 2 values like this or will I have to code each operator individually? -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Dynamic comparison operators
mlangenho...@gmail.com writes:
> I would like to pass something like this into a function
> test(val1,val2,'>=')
>
> and it should come back with True or False.
def test(x,y,c):
return c(x,y)
Call with: test(v1,v2, lambda x,y:x<=y ). A bit noisy imho.
If you have a finite number of comparison operators, put them in a dict:
compares = dict([ ("<",lambda x,y:xhttp://mail.python.org/mailman/listinfo/python-list
Re: Dynamic comparison operators
On 05/24/12 09:32, Phil Le Bienheureux wrote:
>> I would like to pass something like this into a function
>> test(val1,val2,'>=')
>
> You can pass an operator as an argument to your function.
>
> See :
> http://docs.python.org/library/operator.html
And if you want to use strings, you can map them to the functions:
import operator as o
OPERATOR_MAP = {
'=': o.eq,
'==': o.eq,
'!=': o.ne,
'>=': o.ge,
# ...
}
def test(v1, v2, op):
return OPERATOR_MAP[op](v1, v2)
-tkc
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Re: Dynamic comparison operators
Alain Ketterlin writes: > mlangenho...@gmail.com writes: > > > I would like to pass something like this into a function > > test(val1,val2,'>=') > > > > and it should come back with True or False. > > def test(x,y,c): > return c(x,y) > > Call with: test(v1,v2, lambda x,y:x<=y ). A bit noisy imho. Re noisy: import operator as o test(v1, v2, o.le) -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
On Thu, May 24, 2012 at 11:45 PM, Dennis Lee Bieber wrote: > And maybe follow-up with a review of this monster: > http://www.ex-parrot.com/pdw/Mail-RFC822-Address.html That is awesome. Epic. Eyeball-bleeding. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Dynamic comparison operators
On 24/05/2012 10:14 AM, mlangenho...@gmail.com wrote:
I would like to pass something like this into a function
test(val1,val2,'>=')
and it should come back with True or False.
Is there a way to dynamically compare 2 values like this or will I have to code
each operator individually?
Would something like the following meet your need?
Yes, it would be nice if there were a b.__name__ constant.
Colin W.
'''
I would like to pass something like this into a function
test(val1,val2,'>=')
and it should come back with True or False.
Is there a way to dynamically compare 2 values like this or will I have
to code each operator individually?
'''
def test(text):
return eval(text)
a= 25
b= 50
print test('a == b')
print test('a != b')
print test('a <= b')
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Czy dysponujesz dwoma wolnymi godzinami w tygodniu? Oto jak zarobc 185 EUR w tym czasie.
Dzien dobry! Dziekujemy bardzo za zainteresowanie pozycja regionalnego przedstawiciela dostepna obecnie w Polsce i krajach Europy Srodkowej. Chcialem by przedstawic, bardzo krotko - nasza wybitna firme. W.U.G. Inc zostala zalozona w 1992 roku i obecnie stala sie jedna z najbardziej uznawanych firm biznesowych, ktore zapewniaja kompleksowa obsluge swoim klientom. Siec przedstawicielstw West Union Group jest reprezentowana w ponad 32 krajach i swiadczy uslugi do 46 krajow. Specjalizujemy sie w doradztwie w zakresie planowania podatkowego, rejestracji firm, nadajac rowniez dodatkowe finansowe uslugi wsparcia dla firm zagranicznych. WUG jest dobrze znana w USA, Kanadzie i niektorych panstwach Unii Europejskiej. Nasza firma nie moze pozwolic na stworzenie regionalnego biura w kazdym kraju z powodu wysokich kosztow operacyjnych, z tego powodu pragniemy wynajac przedstawiciela regionalnego wypelniac powierzone mu zadania. Wiekszosc naszych operacji z klientami sa przeprowadzane w Internecie. Kiedy klient jest gotowy oplacic za korzystanie z naszych uslug, regionalny przedstawiciel bedzie musial pomoc mu / jej przetworzyc platnosci i upewnic sie, ze fundusze zostaly otrzymane w naleznym czasie. Regionalny Przedstawiciel bedzie odpowiedzialny za pomoc naszym klientom z niektorymi ugodami i przetwarzanie przelewow. Gwarantujemy wynagrodzenie w wysokosci 2500 EUR miesiecznie wyplacane co dwa tygodnie. Nalezy pamietac, ze duza czesc zadan zostanie przedstawiona w ciagu dziennego czasu. Zwroccie uwage, ze proponujemu pozycje o niepelnym wymiarze godzin, wiec trzeba bedzie wydac tylko 2-3 godzin dziennie na tej prace. WUG Inc zabezpieczy nowego pretendenta w calosci oplacalnym dwutygodniowym treningowym okresem. Otrzymaja Panstwo wszystkie niezbedne informacje na temat szkolen od naszego specjalisty po zatrudnieniu. Jesli znajdujecie to interesujacym, zyczliwie prosimy was podac nam wasze dane kontaktowe (naprzyklad numer telefonu, imie i nazwisko), abysmy mogli skontaktowac sie z wami dla dalszej komunikacji. Prosimy nie wahajcie sie z nami skontaktowac w kazdej chwili, jesli macie jakiekolwiek dodatkowe pytania dotyczace tej pozycji. Nasz e-mail: maksymil...@toppolandjobs.com,Najcieplej pozdrawiamy, Maksymilian Skrzypinski Menadzer personelu WUG Inc -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Book for a C Programmer?
On Thu, May 24, 2012 at 08:34:24AM -0500, boB Stepp wrote: > On Thu, May 24, 2012 at 8:28 AM, Javier Novoa C. > wrote: > > On 2012-05-24, alister wrote: > >> On Wed, 23 May 2012 16:45:05 -0700, hsaziz wrote: > >> > >>> I am trying to join an online class that uses python. I need to brush up > >>> on the language quickly. Is there a good book or resource that covers it > >>> well but does not have to explain what an if..then..else statement is? > >>> > >>> Thanks. > >> > >> Dive into python seems to be quite popular & can be read online fro free > >> > >> > > > > Learning Python by Mark Lutz, from O'Reilly is a good one, I've been > > reading it and it also enforces a comparison between C programming and > > Python. However, it's focused on Python 2, but it also mentions Python > > 3 things in the text... > > > > There is a new edition out, copyright 2010 if I recall correctly, that > updates its coverage to Python 3.x, which is the book's primary focus, > though it points out where 3.x syntax does not work in version 2.x. > > Cheers! > boB > Oh thanks! that I didn't knew... -- Javier Novoa C. -- http://mail.python.org/mailman/listinfo/python-list
Embedding Python27 in C++ on Windows: CRT compatibility issues with VS2010?
Hello, I'm a relative python newbie but I've been tasked to figure out how to embed calls to a python library in an Excel XLL add-in. The Python/C API for doing this seems pretty straightforward, but I seem to have read somewhere online that it's important that the C++ program or DLL linking to and embedding Python must be using the same CRT as what the Python implementation dll is using. Is this true, or is the Python API written in such a way that there is no dependency on a common CRT? If there is a dependency, does that mean that I cannot use VS2010 to develop this XLL, but should use VS2008 instead, or are there other workarounds? Thanks for the help, Stephen -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
On 5/24/2012 5:32 AM, niks wrote: Hello everyone.. I am new to asp.net... I want to use Regular Expression validator in Email id verification.. Can anyone tell me how to use this and what is the meaning of this \w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* Not a Python question. It matches anything that looks like a mail user name followed by an @ followed by anything that looks more or less like a domain name. The domain name must contain at least one ".", and cannot end with a ".", which is not strictly correct but usually works. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Book for a C Programmer?
On 05/23/2012 07:45 PM, hsa...@gmail.com wrote: > I am trying to join an online class that uses python. I need to brush up on > the language quickly. Is there a good book or resource that covers it well > but does not have to explain what an if..then..else statement is? > > Thanks. My opinion: Martelli's "Python in a Nutshell" is the K&R of Python. Alas, it does discuss if statements, but it doesn't slap you silly with them. -- http://mail.python.org/mailman/listinfo/python-list
Help doing it the "python way"
Hello, I am an experienced programmer but a beginner to python. As such, I can figure out a way to code most algorithms using more "C" style syntax. I am doing something now that I am sure is a more python way but i can't quite get it right. I was hoping someone might help. So I have a list of grid coordinates (x, y). From that list, I want to create a new list that for each coordinate, I add the coordinate just above and just below (x,y+1) and (x,y-1) right now I am using a for loop to go through all the coordinates and then separate append statements to add the top and bottom. is there a way to do something like: [(x,y-1), (x,y+1) for zzz in coord_list] or something along those lines? thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: Help doing it the "python way"
Scott Siegler wrote: > Hello, > > I am an experienced programmer but a beginner to python. As such, I > can figure out a way to code most algorithms using more "C" style > syntax. > > I am doing something now that I am sure is a more python way but i > can't quite get it right. I was hoping someone might help. > > So I have a list of grid coordinates (x, y). From that list, I want > to create a new list that for each coordinate, I add the coordinate > just above and just below (x,y+1) and (x,y-1) > > right now I am using a for loop to go through all the coordinates and > then separate append statements to add the top and bottom. > > is there a way to do something like: [(x,y-1), (x,y+1) for zzz in > coord_list] or something along those lines? > > thanks! > def vertical_neighbours(coords): for x, y in coords: yield x, y-1 yield x, y+1 new_coords = list(vertical_neighbours(coords)) -- Duncan Booth http://kupuguy.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Help doing it the "python way"
Scott Siegler writes: > is there a way to do something like: >[(x,y-1), (x,y+1) for zzz in coord_list] > or something along those lines? You should read the docs of the itertools module on general principles, since they are very enlightening in many ways. Your particular problem can be handled with itertools.chain: from itertools import chain new_list = chain( ((x,y-1), (x,y+1)) for x,y in coord_list ) You can alternatively write an iterative loop: def gen_expand(coord_list): for x,y in coord_list: yield (x-1,y) yield (x+1, y) new_list = list(gen_expand(coord_list)) -- http://mail.python.org/mailman/listinfo/python-list
Re: Help doing it the "python way"
On 05/24/2012 04:22 PM, Scott Siegler wrote: > Hello, > > I am an experienced programmer but a beginner to python. As such, I can > figure out a way to code most algorithms using more "C" style syntax. > > I am doing something now that I am sure is a more python way but i can't > quite get it right. I was hoping someone might help. > > So I have a list of grid coordinates (x, y). From that list, I want to > create a new list that for each coordinate, I add the coordinate just above > and just below (x,y+1) and (x,y-1) > > right now I am using a for loop to go through all the coordinates and then > separate append statements to add the top and bottom. > > is there a way to do something like: [(x,y-1), (x,y+1) for zzz in coord_list] > or something along those lines? > > thanks! So, where's the code that works? That you want optimized, or "pythonified" ? Your algorithm description is sufficiently confusing that I'm going to have make some wild guesses about what you're after. Apparently you have a list of tuples, and you want to create a second list that's related to the first in the sense that each item (i) of list2 is the sum of the items (i-1) and (i+1) of list1. Presumably you mean sum as in vector sum, where we add the x and y values, respectively. Easiest way to handle edge conditions is to stick an extra (0,0) at both the beginning and end of the list. list1 = [ (3,7), (2,2), (944, -2), (12, 12) ] def sumtuple(mytuple1, mytuple2): return ( mytuple1[0] + mytuple2[0] , mytuple1[1] + mytuple2[1]) def makesum(list1): list2 = [] list1a = [(0, 0)] + list1 + [(0, 0)] for item1, item2 in zip(list1a, list1a[2:]): list2.append( sumtuple(item1, item2) ) return list2 print makesum(list1) output: [(2, 2), (947, 5), (14, 14), (944, -2)] Now, that undoubtedly isn't what you wanted, but perhaps you could clarify the algorithm, so we could refine it. No point in making it more compact till it solves the problem you're actually interested in. -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: Help doing it the "python way"
Paul Rubin writes: > new_list = chain( ((x,y-1), (x,y+1)) for x,y in coord_list ) Sorry: new_list = list(chain( ((x,y-1), (x,y+1)) for x,y in coord_list)) -- http://mail.python.org/mailman/listinfo/python-list
Re: problem loading matlab data with ompc and python
On Thursday, May 24, 2012 5:06:41 AM UTC-7, Tim Williams wrote:
> On May 23, 5:10 pm, no1 wrote:
> > Hi, we're investigating transitioning our company from matlab to python. We
> > found OMPC as a MATLAB m-file-to Python translator, but we're encountering
> > a problem using the translated code to import MATLAB data structures into
> > Python. For example, when we save data within MATLAB this way:
> >
> > x.a = 5;
> > x.b = 6;
> > save -v6 test x
> >
> > this saves data in test.mat, with MATLAB version 6 compatibility (OMPC says
> > it's not compatible with the latest versions of MATLAB). The code to read
> > in data in MATLAB is just
> >
> > load test
> >
> > and when we run it through OMPC we get
> >
> > load(mstring('test.mat'))
> >
> > but when we run it we get the error message
> >
> > File "ompclib\ompclib_numpy.py", line 1496, in load
> > KeyError: "[('a', '|O4'), ('b', '|O4')]"
> >
> > Reading in simpler data (up to arrays) does not have this problem.
> >
> > To get other people in the company to transition, we were hoping that the
> > translation process could be done in one step or on the fly. We could read
> > in MATLAB data using I/O functions imported from scipy, but then the
> > transition isn't seamless any more.
> >
> > Is there a simple fix to using OMPC? Or a similar alternative that would
> > work better?
> >
> > Thanks
>
> Have you tried using loadmat from the scipy.io module?
>
> http://docs.scipy.org/doc/scipy/reference/io.html
Yes (I mentioned the scipi I/O module near the end of my original post) but we
were hoping not to have to require the users to learn any Python to start. The
simpler the process, the less resistance to using the "new" Python methodology;
we were hoping the use of a single "black box" like translator (OMPC) would be
enough. We'd really like to avoid any additional steps for the user, like
rewriting code, otherwise the users are going to resist the transition.
--
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Re: Email Id Verification
John Nagle writes: >It matches anything that looks like a mail user name followed by > an @ followed by anything that looks more or less like a domain name. > The domain name must contain at least one ".", and cannot end with > a ".", which is not strictly correct but usually works. It will reject many valid email addresses. For better guidance on verifying email address values, see the official recommendations in RFC 3696 https://tools.ietf.org/html/rfc3696>. In short: don't bother validating email addresses, the email system is best placed to do that. Just try using them and catch the failures when they happen. -- \ “He was the mildest-mannered man / That ever scuttled ship or | `\ cut a throat.” —“Lord” George Gordon Noel Byron, _Don Juan_ | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: Wish: Allow all log Handlers to accept the level argument
On 24May2012 12:48, Jean-Michel Pichavant wrote:
| Peter Otten wrote:
| > Jean-Michel Pichavant wrote:
| >> Fayaz Yusuf Khan wrote:
| >>> Jean-Michel Pichavant wrote:
| Meanwhile you can shorten the code this way:
| root.addHandler(FileHandler('debug.log'))
| root.handlers[-1].setLevel(DEBUG)
|
| >>> Eh? Readability was the aim.
| >>>
| >> I fail to see how it's not readable, code is short and no magic is
| >> involved provided you know about slicing list items. Anyway, to answer
| >
| > You have to know or verify that .addHandler() appends to the .handlers
list,
| > you have to check if or under which conditions
| >
| > h = SomeHandler()
| > root.addHandler(h)
| > assert h is root.handlers[-1]
| >
| > can fail. In short, if I see such a hack my trust in the author of that
code
| > is significantly lowered.
|
| I now fail to see how it's a hack. handlers is a public attribute of
| loggers.
|
| FYI
|
| def addHandler(self, hdlr):
| """
| Add the specified handler to this logger.
| """
| if not (hdlr in self.handlers):
| self.handlers.append(hdlr)
Nothing there says handlers is a list. (Nothing in the docs says that the
.handlers even exists, AFAICS.) Might be a set or something more esoteric.
Particularly, if I wanted to add and remove handlers a lot I might well
expect (or at least imagine) it to be a set.
So I too find:
root.handlers[-1]
a risky thing to say, and harder to read because it assumes something I
would not want to rely on. Versus the original proposal that avoids all
need to know how logging tracks its handler internally.
Cheers,
--
Cameron Simpson DoD#743
http://www.cskk.ezoshosting.com/cs/
The reason that God was able to create the world in seven days is that he
didn't have to worry about the installed base. - Enzo Torresi
--
http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
On 25May2012 01:20, Chris Angelico wrote: | On Thu, May 24, 2012 at 11:45 PM, Dennis Lee Bieber | wrote: | > And maybe follow-up with a review of this monster: | > http://www.ex-parrot.com/pdw/Mail-RFC822-Address.html | | That is awesome. Epic. Eyeball-bleeding. +1 !! I hope someone's validated that regexp before using it to validate email addresses:-) I'm amazed. (And amazed that the sheer code smell doesn't drive the author away from suggesting it.) The mere presence of nesting comments in RFC2822 addresses prevents using a single regexp to parse them. -- Cameron Simpson DoD#743 http://www.cskk.ezoshosting.com/cs/ "It's state-of-the-art" "But it doesn't work!" "That is the state-of-the-art". -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
On 24May2012 05:32, niks wrote: | Hello everyone.. | I am new to asp.net... Time to run away fast before you're commited then:-) You're aware this is a _python_ list/group, yes? | I want to use Regular Expression validator in Email id verification.. You can't. Valid addresses including nesting comments. Regexps don't do recursion. | Can anyone tell me how to use this and what is the meaning of | this | \w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* If you don't understand it, DON'T use it. And in any case, it is simplistic (== wrong). As pointed out by others in this thread. -- Cameron Simpson DoD#743 http://www.cskk.ezoshosting.com/cs/ Men are four: He who knows and knows that he knows; he is wise, follow him. He who knows and knows not that he knows; he is asleep, wake him. He who knows not and knows that he knows not; he is ignorant, teach him. He who knows not and knows not that he knows not; he is a fool, spurn him! -- http://mail.python.org/mailman/listinfo/python-list
Re: Help doing it the "python way"
On 5/24/2012 2:30 PM Paul Rubin said... Paul Rubin writes: new_list = chain( ((x,y-1), (x,y+1)) for x,y in coord_list ) Sorry: new_list = list(chain( ((x,y-1), (x,y+1)) for x,y in coord_list)) >>> from itertools import chain >>> coord_list = zip(range(20,30),range(30,40)) >>> a = [((x,y-1),(x,y+1)) for x,y in coord_list] >>> b = list(chain(((x,y-1),(x,y+1)) for x,y in coord_list)) >>> a == b True >>> So, why use chain? Is it a premature optimization? Similar to the practice of using "".join(targets) vs targeta+targetb+...+targetn? Emile -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
On Fri, May 25, 2012 at 9:03 AM, Cameron Simpson wrote: > On 24May2012 05:32, niks wrote: > | Hello everyone.. > | I am new to asp.net... > > Time to run away fast before you're commited then:-) > You're aware this is a _python_ list/group, yes? Committed to an asylum or to source control? Python is an asylum. Ruled by a Benevolent Inmate For Life. And yes, it's a life sentence. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
On Thu, 24 May 2012 05:32:16 -0700, niks wrote: > Hello everyone.. > I am new to asp.net... > I want to use Regular Expression validator in Email id verification.. Why do you want to write buggy code that makes your users hate your program? Don't do it! Write good code, useful code! Validating email addresses is the wrong thing to do. The only way to validate an email address is to ACTUALLY SEND AN EMAIL TO IT. That is all. Just because an address is syntactically valid doesn't mean it is deliverable. You can't validate postal addresses. How would you even try? Even if you could, you wouldn't use a regex for it. That's the post office's job to decide whether mail can be delivered, not yours. Who are you to say that some address in Russia or Bolivia or Kuwait is "invalid"? Email addresses are no different. It is the job of the mail server to decide whether email can be delivered, not yours. http://northernplanets.blogspot.com.au/2007/03/how-not-to-validate-email-addresses.html http://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx http://haacked.com/archive/2007/08/26/dont-be-a-validation-nazi.aspx -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
On 25/05/2012 00:03, Cameron Simpson wrote: On 24May2012 05:32, niks wrote: | Hello everyone.. | I am new to asp.net... Time to run away fast before you're commited then:-) You're aware this is a _python_ list/group, yes? | I want to use Regular Expression validator in Email id verification.. You can't. Valid addresses including nesting comments. Regexps don't do recursion. Some regex implementations _can_ do recursion. | Can anyone tell me how to use this and what is the meaning of | this | \w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* If you don't understand it, DON'T use it. And in any case, it is simplistic (== wrong). As pointed out by others in this thread. True, it's the wrong tool for the job. -- http://mail.python.org/mailman/listinfo/python-list
Re: Dynamic comparison operators
On Thu, 24 May 2012 11:22:37 -0400, Colin J. Williams wrote: > On 24/05/2012 10:14 AM, mlangenho...@gmail.com wrote: >> I would like to pass something like this into a function >> test(val1,val2,'>=') >> >> and it should come back with True or False. >> >> Is there a way to dynamically compare 2 values like this or will I have >> to code each operator individually? > > Would something like the following meet your need? > > Yes, it would be nice if there were a b.__name__ constant. What is "a b.__name__ constant", and how will it be useful? As for your solution using eval, please, please, PLEASE do not encourage newbies to write slow, insecure, dangerous code. There are enough security holes in software without you encouraging people to create more. * eval is slow. * eval is dangerous. * eval is using a 200lb sledgehammer to crack a peanut. Any time you find yourself thinking that you want to use eval to solve a problem, take a long, cold shower until the urge goes away. If you have to ask why eval is dangerous, then you don't know enough about programming to use it safely. Scrub it out of your life until you have learned about code injection attacks, data sanitation, trusted and untrusted input. Then you can come back to eval and use it safely and appropriately. Today, your "test" function using eval is used only by yourself, at the interactive interpreter. Tomorrow, it ends up in a web application, and random hackers in China and script-kiddies in Bulgaria now have total control of your server. Any time you hear about some piece of malware or some virus infecting people's systems when they look at a PDF file, chances are high that it is a code injection attack. To learn more, you can start here: http://cwe.mitre.org/top25/index.html Two of the top three most common vulnerabilities are code injection attacks, similar to the improper use of eval. Here is the "eval injection" vulnerability: http://cwe.mitre.org/data/definitions/95.html Also google on "code injection" for many more examples. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Scoping Issues
def adder(): s = 0 def a(x): s += x return sum return a pos, neg = adder(), adder() for i in range(10): print pos(i), neg(-2*i) This should work, right? Why does it not? Checkout slide no. 37 of a Tour of Go to know inspiration. Just wanted to see if python was the same as Go in this regard. Sorry, if I'm being rude, or anything. -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
Steven D'Aprano writes: > Why do you want to write buggy code that makes your users hate your > program? ... > The only way to validate an email address is to ACTUALLY SEND AN EMAIL TO > IT. Of course spamming people will make them hate you even more. Insisting that people give you a valid email address (unless you have a demonstrably legitimate use for it) is a variant of that. -- http://mail.python.org/mailman/listinfo/python-list
Re: Dynamic comparison operators
mlangenho...@gmail.com writes: > I would like to pass something like this into a function > test(val1,val2,'>=') > > and it should come back with True or False. import operator test(val1, val2, operator.ge) -- http://mail.python.org/mailman/listinfo/python-list
Re: Scoping Issues
On 25/05/2012 02:23, SherjilOzair wrote: def adder(): s = 0 def a(x): s += x return sum return a pos, neg = adder(), adder() for i in range(10): print pos(i), neg(-2*i) This should work, right? Why does it not? Checkout slide no. 37 of a Tour of Go to know inspiration. Just wanted to see if python was the same as Go in this regard. Sorry, if I'm being rude, or anything. If you bind to a name (assign to a variable) in a function, that name is by default local to the function unless it's declared as "global" (which means "in this module's namespace") or "nonlocal" (which means "in the enclosing function's namespace") (Python 3 only). -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
On Thu, 24 May 2012 18:35:21 -0700, Paul Rubin wrote: > Steven D'Aprano writes: >> Why do you want to write buggy code that makes your users hate your >> program? ... >> The only way to validate an email address is to ACTUALLY SEND AN EMAIL >> TO IT. > > Of course spamming people will make them hate you even more. Insisting > that people give you a valid email address (unless you have a > demonstrably legitimate use for it) is a variant of that. Ha, of course. I assumed that the OP actually has a valid reason for requesting an email address from the user. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Scoping Issues
On Thu, 24 May 2012 18:23:18 -0700, SherjilOzair wrote: > def adder(): > s = 0 > def a(x): > s += x > return sum > return a I think you mean "return s", not sum. > This should work, right? Why does it not? No, it shouldn't. When you have an assignment, such as "s += x", Python treats s as a local variable. Since s is local to the inner function a(), it has no initial value, and the += fails. In Python 3, you can declare s to be a non-local variable with the nonlocal keyword: def adder(): s = 0 def a(x): nonlocal s s += x return s return a which now works the way you should expect: >>> add = adder() >>> add(1) 1 >>> add(2) 3 >>> add(5) 8 But in Python 2, which you are using, there is no nonlocal keyword and you can only write to globals (declaring them with the global keyword) or locals (with no declaration), not nonlocals. There are a number of work-arounds to this. One is to use a callable class: class Adder: def __init__(self): self.s = 0 def __call__(self, x): self.s += x return self.s Another is to use an extra level of indirection, and a mutable argument. Instead of rebinding the non-local, you simply modify it in place: def adder(): s = [0] def a(x): s[0] += x return s[0] return a -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Scoping Issues
On Thu, May 24, 2012 at 6:23 PM, SherjilOzair wrote:
> def adder():
> s = 0
> def a(x):
Add a "nonlocal s" declaration right here.
See http://www.python.org/dev/peps/pep-3104/
> s += x
> return sum
> return a
>
> pos, neg = adder(), adder()
> for i in range(10):
> print pos(i), neg(-2*i)
>
> This should work, right? Why does it not?
Python doesn't have a C-like variable declaration scheme. So without a
`global` or `nonlocal` declaration, you can only assign to names which
reside in the innermost scope.
> Checkout slide no. 37 of a Tour of Go to know inspiration.
You mean slide #38 ("And functions are full closures.").
> Just wanted to see if python was the same as Go in this regard. Sorry, if I'm
> being rude, or anything.
I would suggest reading through the Python Language Reference
(http://docs.python.org/release/3.1.5/reference/index.html ) prior to
asking further questions, as it may well answer them for you.
Cheers,
Chris
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Re: Embedding Python27 in C++ on Windows: CRT compatibility issues with VS2010?
On 25/05/2012 2:10 AM, Stephen Lin wrote: Hello, I'm a relative python newbie but I've been tasked to figure out how to embed calls to a python library in an Excel XLL add-in. The Python/C API for doing this seems pretty straightforward, but I seem to have read somewhere online that it's important that the C++ program or DLL linking to and embedding Python must be using the same CRT as what the Python implementation dll is using. Is this true, or is the Python API written in such a way that there is no dependency on a common CRT? It depends on the APIs you use. eg, some APIs take a "FILE *" and some may take ownership of memory - such APIs needs to use the same CRT. APIs that don't attempt to share CRT "objects" should be fine. Mark If there is a dependency, does that mean that I cannot use VS2010 to develop this XLL, but should use VS2008 instead, or are there other workarounds? Thanks for the help, Stephen -- http://mail.python.org/mailman/listinfo/python-list
Re: Scoping Issues
On 05/24/2012 09:23 PM, SherjilOzair wrote: > def adder(): > s = 0 > def a(x): > s += x > return sum > return a > > pos, neg = adder(), adder() > for i in range(10): > print pos(i), neg(-2*i) > > This should work, right? Why does it not? > Guess that depends on what you mean by work. First, it gets a syntax error on the print function call, because you omitted the parens. When I fixed that, I got UnboundLocalError: local variable 's' referenced before assignment so I fixed that, and got inconsistent use of tabs and spaces in indentation because you mistakenly used tabs for indentation. Then I got the output because sum is a built-in function. Presumably you meant to return s, not sum. Here's what I end up with, and it seems to work fine in Python 3.2 on Linux: def adder(): s = 0 def a(x): nonlocal s s += x return s return a pos, neg = adder(), adder() for i in range(10): print (pos(i), neg(-2*i)) . Output is: 0 0 1 -2 3 -6 6 -12 10 -20 15 -30 21 -42 28 -56 36 -72 45 -90 -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
On Fri, May 25, 2012 at 11:35 AM, Paul Rubin wrote: > Steven D'Aprano writes: >> Why do you want to write buggy code that makes your users hate your >> program? ... >> The only way to validate an email address is to ACTUALLY SEND AN EMAIL TO >> IT. > > Of course spamming people will make them hate you even more. Insisting > that people give you a valid email address (unless you have a > demonstrably legitimate use for it) is a variant of that. But why do you want to validate the email address? That's the question. Usually it's because you're going to be sending emails to that address, in which case you not only want to ensure that it's a real address, you want to ensure that the person who keyed it in is legitimately allowed to do so - the usual implementation of that being "please check your emails for the confirmation code". There are, however, ways of not-quite-sending an email. For instance, you can connect to the domain's MX, give your HELO, MAIL FROM, and RCPT TO commands, and then quit before sending any DATA. That won't give a 100% guarantee, but it'll certainly tell you about a lot of failures (most of them in that first megastep of looking up the domain in DNS to find its MX record, and then attempting a connection). Now, if your goal is to recognize email addresses in plain text (eg to make them clickable), then you probably don't want true validation - you want more of a DWIM setup where common "tails" aren't included [for instance, an email address followed by a close bracket, like f...@bar.com]. That's completely different. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Scoping Issues
On 5/24/2012 8:59 PM, Dave Angel wrote: > so I fixed that, and got > inconsistent use of tabs and spaces in indentation > > because you mistakenly used tabs for indentation. Not to start another tabs-vs.-spaces discussion, but tabs are perfectly legal indentation in Python. That exception is raised when the interpreter can't determine how much a line is indented because tabs and spaces are both used. -- CPython 3.3.0a3 | Windows NT 6.1.7601.17790 -- http://mail.python.org/mailman/listinfo/python-list
Re: Namespace hack
Pardon me for breaking threading, but Daniel's response is not available
on my ISP's news server, and I only discovered it by accident.
On Thu May 24 15:04:34 CEST 2012, Daniel Fetchinson wrote:
> > On Thu, 24 May 2012 08:50:59 +, Steven D'Aprano wrote:
> > From the Zen of Python ("import this"):
> > Namespaces are one honking great idea -- let's do more of those!
[...]
> Funny, you got to the last line of "import this" but apparently
> skipped the second line:
>
> Explicit is better than implicit.
>
> And you didn't even post your message on April 1 so no, I can't laugh
> even though I'd like to.
Do you object to the ability to write standard Python modules?
# module.py
def spam(obj, n):
return len(obj) + n
def ham(obj):
return spam(obj, 23)
By your apparent misunderstanding of the Zen, you think that this should
be written with oodles of more explicitness, 'cos explicit is always
better, right?
keyword.def globals.spam(locals.obj, locals.n):
keyword.return builtin.len(locals.obj) + locals.n
keyword.def globals.ham(locals.obj):
keyword.return globals.spam(locals.obj, 23)
Python, like most (all?) non-trivial languages, has scoping rules so that
you can refer to names without explicitly specifying which namespace they
are in. So long as this is unambiguous, Explicit vs Implicit is
irrelevant if not outright wrong.
My namespace decorator simply applies a slightly different set of scoping
rules to the ones you are already used to in modules. It's no worse than
nested functions (hardly a surprise, because it is built on nested
functions!) or module-level scoping rules.
--
Steven
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Is there a custom fields plugin or component of django
I want to find a plugin of django what it can custom fields in the form. The functions include custom fields in web page and create the fields in database. plugin's flow like these: 1.we can define fields in web page --> 2.create the table in database(table includes all custom fields) --> 3.generate CURD operations in web server --> 4.we can CURD records in web pages. I want to know whether there is a plugin or component of django, If there is please tell me. Maybe there is the other plugin like this as well. -- http://mail.python.org/mailman/listinfo/python-list
Re: Help doing it the "python way"
On 5/24/2012 4:53 PM, Duncan Booth wrote: Scott Siegler wrote: Hello, I am an experienced programmer but a beginner to python. As such, I can figure out a way to code most algorithms using more "C" style syntax. Hi, welcome to Python. I came here from C also. I am doing something now that I am sure is a more python way but i can't quite get it right. I was hoping someone might help. So I have a list of grid coordinates (x, y). From that list, I want to create a new list that for each coordinate, I add the coordinate just above and just below (x,y+1) and (x,y-1) The Python way, especially the Python 3 way, is to not make the new sequence into a concrete list unless you actually need a list to append or sort or otherwise mutate. In many use cases, that is not necessary. right now I am using a for loop to go through all the coordinates and then separate append statements to add the top and bottom. is there a way to do something like: [(x,y-1), (x,y+1) for zzz in coord_list] or something along those lines? def vertical_neighbours(coords): for x, y in coords: yield x, y-1 yield x, y+1 new_coords = list(vertical_neighbours(coords)) -- Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Scoping Issues
On 05/24/2012 10:27 PM, Andrew Berg wrote: > On 5/24/2012 8:59 PM, Dave Angel wrote: >> so I fixed that, and got >> inconsistent use of tabs and spaces in indentation >> >> because you mistakenly used tabs for indentation. > Not to start another tabs-vs.-spaces discussion, but tabs are perfectly > legal indentation in Python. That exception is raised when the > interpreter can't determine how much a line is indented because tabs and > spaces are both used. > I configure my editor(s) to always use spaces for indentation. So a file that currently uses tabs is unusable to me. You of course are right that tabs are syntactically correct, but until I find another editor that makes tabs visible (like the one I used 20 years ago) they're unacceptable to me. -- DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
Paul Rubin writes: > Steven D'Aprano writes: > > Why do you want to write buggy code that makes your users hate your > > program? ... > > The only way to validate an email address is to ACTUALLY SEND AN EMAIL TO > > IT. > > Of course spamming people will make them hate you even more. Use the email address without spamming, then. The point is that, having collected the email address, it's useless unless one actually uses it *as an email address*, by sending a message to it. Before then, “validating” it tells you nothing. > Insisting that people give you a valid email address (unless you have > a demonstrably legitimate use for it) is a variant of that. And matching it against a regex is going to either get it wrong (rejecting many valid email addresses), or be useless (accepting just about anything as “valid”). The test which matters is to use the value as an email address, by sending a message when the time comes to do that. -- \ “It's my belief we developed language because of our deep inner | `\ need to complain.” —Jane Wagner, via Lily Tomlin | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: Namespace hack
[Default] On 25 May 2012 02:47:11 GMT, Steven D'Aprano wrote: >Do you object to the ability to write standard Python modules? > ># module.py >def spam(obj, n): >return len(obj) + n > >def ham(obj): >return spam(obj, 23) > > >By your apparent misunderstanding of the Zen, you think that this should >be written with oodles of more explicitness, 'cos explicit is always >better, right? > >keyword.def globals.spam(locals.obj, locals.n): >keyword.return builtin.len(locals.obj) + locals.n > >keyword.def globals.ham(locals.obj): >keyword.return globals.spam(locals.obj, 23) > > >Python, like most (all?) non-trivial languages, has scoping rules so that >you can refer to names without explicitly specifying which namespace they >are in. So long as this is unambiguous, Explicit vs Implicit is >irrelevant if not outright wrong. > >My namespace decorator simply applies a slightly different set of scoping >rules to the ones you are already used to in modules. It's no worse than >nested functions (hardly a surprise, because it is built on nested >functions!) or module-level scoping rules. > > >-- >Steven But then we've got "Simple is better than complex", and "Complex is better than complicated". Of course if we decided to start iterating through the zen of Python's verses and continually modifying the example code to fit, it would get rather silly rather fast. ~Temia -- When on earth, do as the earthlings do. -- http://mail.python.org/mailman/listinfo/python-list
Re: Email Id Verification
Ben Finney writes: > The point is that, having collected the email address, it's useless > unless one actually uses it *as an email address*, by sending a message > to it. Before then, “validating” it tells you nothing. Right, the only legitimate use of an email address is sending legitimate email to it. An example might be collecting an address so that service staff can respond to a help request. If there is not an up-front, good reason to want to email the address, then collecting it is not legitimate. An example is web sites where users have to supply addresses to register. This is why mailinator.com was invented, but it's annoying even if you use mailinator. -- http://mail.python.org/mailman/listinfo/python-list
Re: Namespace hack
On Fri, May 25, 2012 at 1:02 PM, Temia Eszteri wrote: > But then we've got "Simple is better than complex", and "Complex is > better than complicated". Of course if we decided to start iterating > through the zen of Python's verses and continually modifying the > example code to fit, it would get rather silly rather fast. > Silly but amusing. As with all these sorts of documents, the Zen of Python is self-contradictory; it's always left up to an intelligent human to decide when to apply which rule. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
