e name to a
different object, no, it isn't possible actually.
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here I had a constructor
> with parameters
Programming by accident is a well-known antipattern.
> - except now Im feeling foolish because I cant
> replicate the error - which suggests I didnt understand the error
> message properly in the first place...
And that you misunderstood
glenn wrote:
>>> Bruno Desthuilliers wrote:
>>
>> http://www.python.org/download/releases/2.2.3/descrintro/#mro
> thanks - interesting essay/article - a lot in their I've never really
> considered - though its only recently ive started playing with multiple
>
our friend:
class Knight(object):
def __init__(self):
self._saywhat = "ni"
self._wantwhat ="shrubbery"
def says(self):
return self._saywhat
def wants(self):
return self._wantwhat
k = Knight()
print getattr(k, "says")()
print getattr(k, "wa
choice', False)
# braindead metaclass
class ChoicesMeta(type):
def __init__(cls, name, bases, classdict):
cls.choices = [name for name, attrib in classdict.items() \
if is_choice(attrib)]
# our class...
class Foo(object):
__metaclass__ = ChoicesMeta
def __init
John Salerno a écrit :
> Are there any major differences between these two?
Yes. SQLAlchemy is, mainly, a very higher-level DB-API that makes
working with a RDBMS almost transparent (no embedded SQL unless you
really wants to) without trying to pretend there's no RDBMS nor forcing
you into ORM
Joel Hedlund a écrit :
> Hi!
>
> The question of type checking/enforcing has bothered me for a while,
(snip)
>
> I've also whipped up some examples in order to put the above questions
> in context and for your amusement. :-)
(snip)
> These are the attached modules:
>
> * nocheck_module.py:
>
software than what I could
come with by myself (been here, done that...), is IMVHO a wrong
solution. I mean, a RDBMS is not a persistence engine, it's a data
management tool. If you don't need a relational model, or if it doesn't
match your app's needs, then why use one when we
have a specific syntax for the class object definition and not
> for objects of different type?
>
> so if i want to define a new class object (my_class for example) with a
> new object syntax:
>>> instance my_class:
>>> __class__ = object
>>> __metaclass__
Joel Hedlund wrote:
>> Short answer: Use Traits. Don't invent your own mini-Traits.
>
> Thanks for a quick and informative answer! I'll be sure to read up on
> the subject. (And also: thanks Bruno for your contributions!)
>
>> Types are very frequently exactly
Joel Hedlund wrote:
> Bruno >> Your email address seem to be wrong.
let's say "disguised" !-)
> I tried to reply to you
> directly in order to avoid thread bloat but my mail bounced.
I don't think it's a good idea anyway - this thread is on topic h
gt; if you're really serious, unit tests is the way to go - they can check
>> for much more than just types.
>
> Yes, I'm very much serious indeed. But I haven't done any unit testing.
Then you probably want to read the relevant chapter in DiveIntoPython.
HTH
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Antal Rutz wrote:
> hi,
>
> is there something wrong with django's website (djangoproject.com)
Obviously, yes.
> or I have problems?
I don't think so.
I warned them on the google group, I think things should be fixed soon.
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es here,
Nope --> My Very Humble Opinion
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elevant for an persistency mechanism targetting an OO language:
RDBMS are not "persistency mechanism", they are data management tools.
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Paul Rubin a écrit :
> Bruno Desthuilliers <[EMAIL PROTECTED]> writes:
>
>>I've rarely encoutered "silent" data corruption with Python - FWIW, I
>>once had such a problem, but with a lower-level statically typed
>>language (integer overflow), and
lazaridis_com wrote:
> Ο/Η Bruno Desthuilliers έγραψε:
>> lazaridis_com wrote:
>>> John Salerno wrote:
>>>> Are there any major differences between these two? It seems they can
>>>> both be used with TurboGears, and SQLAlchemy with Django. I'm just
&g
-style classes and the descriptor protocol
may help:
http://www.python.org/download/releases/2.2.3/descrintro/
http://users.rcn.com/python/download/Descriptor.htm
HTH
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alf a écrit :
> Hi,
>
> I have a reference to certain objects. What is the most pythonic way to
> test for valid reference:
>
> if obj:
Don't do this:
for o in [0, '', [], {}, ()]:
print obj, bool(obj), obj is None
> if None!=obs:
In python, assignement is a statement, not an exp
Chris Brat a écrit :
> Thanks, thats exactly what I was looking for - very neat.
>
Just note that both solutions rebind the name to a newly constructed
list instead of modifying the original list in place. This is usually
the RightThing(tm), but sometimes one wants an in-place modification.
--
Carl Banks wrote:
> Bruno Desthuilliers wrote:
>> In python, assignement is a statement, not an expression, so there's no
>> way you could write 'if obj = None' by mistake (-> syntax error). So
>> this style is unpythonic. Also, None is a singleton, and ident
ssible. In it's category,
it beats Access and MySQL hands down. Now if you want a real RDBMS,
you've just failed to choose the right tool. May I suggest PostgreSQL ?
(snip useless rant)
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the
current namespace. The 'import *' loads all public names from
. And FWIW it's usually considered bad style (potential
name clash, and can makes hard to tell where a name is defined...)
HTH
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lazaridis_com wrote:
> Bruno Desthuilliers wrote:
>> lazaridis_com wrote:
>>> Ο/Η Bruno Desthuilliers έγραψε:
>>>> lazaridis_com wrote:
>>>>> John Salerno wrote:
>>>>>> Are there any major differences between these two? It seems th
d you read the manuals at all then ?
>> Live with it or use a real RDBMS.
>
> I don't mind living with it as long as it's documented.
It is. In SQLite manual. Or do you hope the Python manual to also fully
document PostgreSQL, MySQL, Oracle, Apache, Posix, Win32 etc ?
--
b
etc).
Coming from C++, you'll probably need a few days to grasp Python's
object model and idioms (Python looks much less like a dumbed-down C++
than Java), but my bet is that you'll be productive *way* sooner with
Python, and *much* more productive.
My 2 cents,
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as) some licencing limitations on Windows.
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Jason wrote:
> Bruno Desthuilliers wrote:
>> With a GUI ? If so, you probably want to check out wxPython or PyGTK
>> (wxPython will also buy you MacOS X IIRC, and wil perhaps be easier to
>> install on Windows).
>
> Just a warning: wxPython does operate slightly dif
Or go for a
saner design...
> but clearly that is not happening.
> Can someone explain why.
Test2(2,True) calls Test2.__init__() with a Test2 instance 'self' and
y=True. Test2.__init__() then calls Test.__init__() with the same
instance and y=True. So the branch:
if y:
self.getx =
nstanciated. You
mentioned NotImplementedError, which is indeed the usual way to make
something "abstract" in Python.
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his problem?
Not out of my hat. Just a few considerations on Python and OO: Python
being dynamically typed, inheritence is only about sharing
implementation. There's another way to do share implementation -
composition/delegation. It's more flexible, and can avoid "cartesian
product&quo
Butternut Squash wrote:
> What do you guys recommend for doing middle tier in python.
> I want to hide the database from the application
Why ?
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p in &
there is a more correct
> term.
Depends if instanciating this base class would make any sense.
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> sys.exit(2)
> #usage()
>
> for opt, arg in opts:
> if opt in ("-l", "--latest"):
> latest = int(arg)
> elif opt in ("--notfound"):
> ignoreNotFound = True #add notfound files to log
OMG. optparse is far better than this.
(snip)
My overall feeling is that in most function, you're mixing too much
different concerns. Each function should do *one* thing (and do it
well). The most obvious problem here is about mixing application logic
and UI. Application logic (what your app is effectively doing) should be
as independant as possible of UI concerns. If possible, you should be
able to reuse most of the application logic (except for the main() func,
which in your case is the command-line UI) as a module in other
applications. Now there are time when the application code needs to
notify the UI. The good news is that Python makes it easy to makes this
generic, using callback functions or objects provided by the UI and
called when appropriate by the application logic. The key here is to
come up with a clear, well-defined interface between logic code and UI code.
A last point : avoid globals whenever possible. Either pass values as
arguments to functions or use a kind of config object if there are too
much configuration stuff.
My 2 cents
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Frank Millman wrote:
> Bruno Desthuilliers wrote:
>> Frank Millman wrote:
>>> [EMAIL PROTECTED] wrote:
>>>> There aren't abstract classes in Python. They are all
>>>> concrete.
>> (snip)
>>> I use the term 'abstract class' in
Maric Michaud a écrit :
> Le vendredi 08 septembre 2006 10:15, Bruno Desthuilliers a écrit :
>
>>You
>>mentioned NotImplementedError, which is indeed the usual way to make
>>something "abstract" in Python.
>
>
> Hummm, some more thoughts about this.
James Stroud a écrit :
> Hello All,
>
> I am interested in setting up a modest invoicing system for some
> consulting I am doing. I like the idea of managing this on the web and
> creating invoices and printing them from a browser. However, I'm not
> really sure where to start. I've played with
jason a écrit :
Just some more suggestions:
> def parselog(data):
> other = 0
> records = {}
>
> for line in string.split(data, '\n'):
for line in data.split('\n'):
> str = line.strip()
This will shadow the builtin 'str' type. You could reassign to 'line'
instead, or
Wensheng a écrit :
> I installed pysqlite2 using easy_install.
> and got this when using it from modpython:
> --
> Mod_python error: "PythonHandler etc.modpython"
>
> Traceback (most recent call last):
ddtl a écrit :
> On 7 Sep 2006 10:42:54 -0700, in comp.lang.python you wrote:
>
>
>>Let's examine what the mro order is for class D:
>>
>D.mro()
>>
>>[, , ,
>>>n__.A'>, ]
>>
>>When you call d.met(), the call dispatches to the D.met() method.
>>After printing out 'D.met', you use super() to ge
ips of and between the items of data?
Looks a lot like a RDBMS...
> It seems to me that if this could be done, then it could be used to
> dynamically
> generate the routines needed for validation, update, etc...
>
> But my brain strains when I try to think about how to do it...
Yo
[EMAIL PROTECTED] wrote:
> Bruno Desthuilliers wrote:
>> [EMAIL PROTECTED] wrote:
>>> Probably just me. I've only been using Access and SQL Server
>>> for 12 years, so I'm sure my opinions don't count for anything.
>>>
>> SQLite neve
[EMAIL PROTECTED] wrote:
(snip)
> Are you saying that MySQL is goofy? ;-)
>
This is an understatement.
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Paul Boddie wrote:
> Bruno Desthuilliers wrote:
>> Wensheng a écrit :
>>> I installed pysqlite2 using easy_install.
>>> and got this when using it from modpython:
>>> ---
eciated. Your sarcastic, condescending tone kind of gets in
> the way of the message, though.
What about jokes on "waterheadretard" then ?
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Note to the OP: if None is a valid value for the variable, you may use
another object, ie:
def somefunc(*args, **kw):
variable = _marker = object()
(...)
if variable is _marker:
print "not defined"
(...)
--
bruno desthuilliers
python -c "print '@'.joi
Paul Boddie wrote:
> Bruno Desthuilliers wrote:
>> eggs are the Python's equivalent to Java's JAR, not a RPM-like. I said
>> it was not an egg-specific issue (which is not totally accurate) because
>> it mostly have to do with loading dynamic libs (.so, .dll etc)
)
def defaultFunc(*args, **kw):
return "defaultFunc called with %s %s" % (str(args), kw)
class SwitchFunc(object):
def __init__(self, default, **kw):
self._default = default
self._switch = kw
# makes the object callable.
def __call__(self, case, *args, **kw):
func = self._switch.get(case, self._default)
return func(*args, **kw)
switch = SwitchFunc(defaultFunc, a=funcA, b=funcB, c=funcC)
for case in "abcX":
print switch(case, "foo", q=42)
HTH
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g, id(arg))
def runtest():
obj = ["Life, universe and everything"]
print "in runtest : obj is %s (%s)" % (obj, id(obj))
print "calling test with obj:"
test(obj)
print "in runtest: now obj is %s (%s)" % (obj, id(obj))
Here again, if you want your func
[EMAIL PROTECTED] wrote:
> Bruno Desthuilliers wrote:
>> [EMAIL PROTECTED] wrote:
(snip)
>>> class caseFunction(object):
>>> def __init__(self):
>>> self.caseDict = {'a':"retval = 'a'",
>>> 'b':"r
waylan a écrit :
(snip)
>
> While Steve's examples certainly do the trick in this limited case, I
> assumed that the original poster was just starting with mod_python and
> I was simply trying to explain the bigger picture for future reference.
> As one develops more sophisticated code, simply add
to come up with the most possibly Q&D solution:
res = int(str(5 + 7)[-1])
Like it ?-)
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x27; operator. For example:
>
> print 5 ^ 7
>
>
>>> 10 ^ 21
31
Not really "less than 10"...
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Christophe wrote:
> Bruno Desthuilliers a écrit :
>> Bryan Olson wrote:
>>> Hugh wrote:
>>>> Sorry, here's an example...
>>>>
>>>> 5+7=12
>>>>
>>>> added without carrying, 5+7=2
>>>>
>>>>
;t care if the objects is a file or not - you just care if the
object support the subset of the file interface you intend to use. And
this, you'll only know at runtime.
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the rest of the code, but if it's something
like this :
def show_lines(fileobj):
for line in fileobj:
print line
it will just work...
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Luis P. Mendes a écrit :
> Hi,
>
> I have the following problem:
>
> I instantiate class Sistema from another class. The result is the same
> if I import it to interactive shell.
>
> s = Sistema("par")
>
> class Sistema:
> def __init__(self, par):
> cruza_ema = CruzaEmas(par)
>
>
Jon Ribbens a écrit :
> In article <[EMAIL PROTECTED]>, Bruno Desthuilliers wrote:
>
>>Hugh wrote:
>>
>>>Sorry, here's an example...
>>>
>>>5+7=12
>>>
>>>added without carrying, 5+7=2
>>>
>>>i.e the
Thorsten Kampe a écrit :
(snip)
> PS Actually the author wrote the finest and best Windows Editor and I
> also use EditPad Pro under Linux (together with Wine) because of the
> lack of usables editors under Linux.
I guess we don't have the same definition of a "usable" editor...
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times before understanding what it means.
>> >
>> Where have you read that?
>>
>> wildemar
>
> I don't mean to start a flame war about this but here are some
> reference of people, who like me, don't like the current python doc:
> http://xahlee.org/Unix
nload page, i'd greatly appreciate if you share it
> with me.
http://www.webwareforpython.org/WebKit/Docs/InstallGuide.html#mod-webkit
"""
The source code and a README file describing how to configure and build
mod_webkit are located in the Webware/WebKit/Adapters/mod_webkit
"
initively have a look at setuptools before
proceeding to reinventing the SquareWheel(tm):
http://peak.telecommunity.com/DevCenter/setuptools
--
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w to generate SQLAlchemy schemas instead.
My 2 cents...
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p in '[EMAIL PROTECTED]'.split('@')])"
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lert ! Unusable undocumented monstruosity ahead...
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Samuel a écrit :
>>FWIW, there's a Python port of adodb:
>>http://phplens.com/lens/adodb/adodb-py-docs.htm
>>
>>and parsing XML in Python is quite easy. So you could as well port the
>>AdoDB XML to Python too.
>
>
> That is exactly what I am trying to avoid. While implementing the
> parser might
John Salerno a écrit :
> Forgive my excitement, especially if you are already aware of this, but
> this seems like the kind of feature that is easily overlooked (yet could
> be very useful):
>
>
> Both 8-bit and Unicode strings have new partition(sep) and
> rpartition(sep) methods that simplif
in the app code, a simple 'import config', which allow acces
to config vars via 'config.varname' (clean namespaces really improve
maintainability).
My 2 cents
> Regards
>
> Joakim
>
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n.query(sqlcheck1)
pubType = cmi.fetch_rows(overseas1)
"""
May we have the url where we can see this application in action ? I know
some crackers that would be really pleased to mess with your production
database...
--
bruno desthuilliers
python -c "print '@&
Fuzzydave wrote:
> I am back developing futher our Python/CGI based web application run by
> a Postgres DB
> and as per usual I am having some issues. It Involves a lot of Legacy
> code.
s/Legacy/Norwegian Blue/
--
bruno desthuilliers
python -c "print '@'.join(
John Salerno a écrit :
> Bruno Desthuilliers wrote:
>
>> Err... is it me being dumb, or is it a perfect use case for str.split ?
>
>
> Hmm, I suppose you could get nearly the same functionality as using
> split(':', 1), but with partition you also get the se
Gabriel Genellina wrote:
(snip)
> When you construct an object instance, it is of a certain type from that
> precise moment, and you can't change that afterwards.
Err... Actually, in Python, you can. It's even a no-brainer.
(snip)
--
bruno desthuilliers
python -c "print
init__(self, world)
# 'override' World.dothat:
def dothat(self, bar):
bar = bar * 3
return self.world.dothat(bar)
# automagically delegate other stuff:
def __getattr__(self, name):
return getattr(self.world, name)
HTH
--
bruno desthuilliers
python -c "print &
ced', 'f', 'aazaz']
>>> "ab-eced-ff-aazaz".split('-')
['ab', 'eced', 'ff', 'aazaz']
>>>
--
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p in '[EMAIL PROTECTED]'.split('@')])"
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y all the gory details of HTTP response
headers. And most also offer a data access layer over a RDBMS or an OODBMS.
IOW, wsgi will not saves you from learning to use a specific web
framework. Nor will it saves you from learning *at least* the HTTP
protocol, and most probably html, css, Javascript etc.
[EMAIL PROTECTED] wrote:
(please, *stop* top-posting - corrected)
> Bruno Desthuilliers wrote:
>>
>> [EMAIL PROTECTED] wrote:
>> (OT : please dont top-post)
>>
>>> What I tried to do is to write a string.split() module,
>> So don't waste time:
>
ess.
Else, it may or not be a valid email address - and then the only
reliable way to know is to send a mail to that address.
> and
> possibly belongs to the user...
How do you intend to check this ?
--
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python -c "print '@'.join(['.'.join([w[::-1] for
Gabriel Genellina wrote:
> At Thursday 21/9/2006 09:14, Bruno Desthuilliers wrote:
>
>> > When you construct an object instance, it is of a certain type from
>> that
>> > precise moment, and you can't change that afterwards.
>>
>> Err... Actua
crystalattice a écrit :
> I've been working on a game for several months but now I'm thinking I
> may be going about it the wrong way. It's an online RPG designed to
> recreate a pen & paper session, kind of like the OpenRPG project.
>
> Originally I planned on doing something like OpenRPG with a
sam a écrit :
> i am starting to experiment with recursion, and decided to write a
> fairly trivial little program which took a float as input, then called
> a function to halve it recursively until it was less than 1:
And forgot to return the result from the recursive call, I guess ?-)
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Neil Cerutti a écrit :
(snip)
> It's not out of the kindness of our hearts that we help. Heck, I
> don't know what it is. Probably I just like reading my own drivel
> on the internet and occassionally helping others is a good
> excuse.
Lol !-)
+1 OTQOTW
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George Sakkis a écrit :
> Daniel Nogradi wrote:
>
>>In a recent thread,
>>http://mail.python.org/pipermail/python-list/2006-September/361512.html,
>>a couple of very useful and enlightening itertools examples were given
>>and was wondering if my problem also can be solved in an elegant way
>>by it
crystalattice wrote:
> Bruno Desthuilliers wrote:
>> I have few experience with RPG softwares, but if your "domain" logic si
>> anything more than trivially complex, it's always better to keep it as
>> decoupled as possible from the user interface (unless of c
Sébastien Ramage wrote:
> Bonjour à tous,
Hi Sébastien.
Wrong newsgroup, I'm afraid - either repost here in english, or post to
fr.comp.lang.python...
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bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.&
walterbyrd wrote:
> If so, I doubt there are many.
We're at least two here...
> I wonder why that is?
>
I wonder why you have such an a priori ?
--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) fo
them ...
devices = ["PCI:2:3.0", "PCI:3.4:0"]
for d in device:
nums = tuple(map(int, d.split(':')[1:]))
print "for ", d, " : ", nums
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bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])"
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Neal Becker a écrit :
> Any suggestions for transforming the sequence:
>
> [1, 2, 3, 4...]
> Where 1,2,3.. are it the ith item in an arbitrary sequence
>
> into a succession of tuples:
>
> [(1, 2), (3, 4)...]
>
> In other words, given a seq and an integer that specifies the size of tuple
> to r
Fabian Steiner a écrit :
> Bruno Desthuilliers wrote:
>
>>Fabian Steiner wrote:
>>
>>>I often have to deal with strings like "PCI:2:3.0" or "PCI:3.4:0" and
>>>need the single numbers as tuple (2, 3, 0) or (3, 4, 0). Is there any
>>>
John Salerno a écrit :
> It's a nice thought that a person can earn a living programming with
> Python, which is fun enough to use just for its own sake. But for
> someone like me (i.e. no programming experience) it's always a little
> disheartening to see that most (if not all) job descriptions
[EMAIL PROTECTED] a écrit :
> A very old thread:
> http://groups.google.com/group/comp.lang.python/browse_frm/thread/2c5022e2b7f05525/1542d2041257c47e?lnk=gst&q=for+else&rnum=9#1542d2041257c47e
>
> discusses the optional "else:" clause of the for statement.
>
> I'm wondering if anyone has ever fo
example.py, and I'd like to incorporate it
> **into** part of an HTML page with nice syntax highlighting and all the
> shebang. Is there an easy way to do so?
I suppose this has more to do with the course presentation than with
it's content !-)
However, Trac's wiki is probably a go
ce). FWIW, you may want to post this on fclpy too - there are some
"hard-core" Windows developpers there...
You can also point your boss to IronPython - if MS puts some money on
it, it can't be a bad tool, isn't it ?-)
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bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])"
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John Henry wrote:
> I don't know what windev is
A french (highly proprietary) so-called "CASE-Tool" with a so-called
"5th generation language" (lol) that is mostly a dumbed-down mix of
basic and pascal. It's so bad that it makes you regret VB6.
--
bruno desthu
urn [a,b]
>
> should be:
> return [a].extend(b)
A Lisp cons is made of a reference to it's content and a reference to
the rest of the list, so cons = lambda a, b : [a, b] seems the most
straightforward translation.
>> def car(structure)
>>return structure[
gain, you cannot *remove* anything from a string - you can just
have a modified copy copy of the string. (NB : answer is just above :
use str.strip())
HTH
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bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])"
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e.compile('blah').atstartof(string)
> re.compile('blah').atendof(string)
What's wrong with:
re.search(r'^blah', somestring)
re.search(r'blah$', somestring)
--
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w
Brendon Towle wrote:
> On 28 Sep 2006, at 8:05 AM, [EMAIL PROTECTED] wrote:
>
>> From: Bruno Desthuilliers <[EMAIL PROTECTED]>
>>
>> Brendon Towle wrote:
>>> Some of your Lisp translations are subtly off...
>>
>> Seems correct to me. Lisp l
= kw.get('titles', [])
self.birthdate = kw.get(birthdate, None)
# etc
> Does a question like this depend on how the class will be used?
I don't think it would make sens to design anything without any hint
about how it's supposed to be used.
My 2 cents
--
bruno des
Roy Smith a écrit :
> In article <[EMAIL PROTECTED]>,
> "Carl J. Van Arsdall" <[EMAIL PROTECTED]> wrote:
>
>
>>>Things like decorators and metaclasses certainly add power, but they add
>>>complexity too. It's no longer a simple language.
>>>
>>
>>Well, I think a simple language is a language
tobiah a écrit :
> SpreadTooThin wrote:
>
>> f = open('myfile.bin', 'rb')
>>
>> How do I know if there was an error opening my file?
>>
> try:
> open('noexist')
> except:
> print "Didn't open"
>
Should be:
try:
f = open('noexists')
except IOError, e:
print >> sys.stderr, "
close my eyes
Well... Not quite Common Lisp yet, but :
http://www.biostat.wisc.edu/~annis/creations/PyLisp/
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bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])"
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