Gregory Ewing writes:
> Oh, undoubtedly. I just don't think it helps understand how burritos
> are used in prog... er, that is, how monads... well, you know what I
> mean.
How about in math?
https://www.cs.cmu.edu/~edmo/silliness/burrito_monads.pdf
;-)
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Paul Rubin writes:
>https://www.cs.cmu.edu/~edmo/silliness/burrito_monads.pdf
Whoops, url changed:
http://emorehouse.web.wesleyan.edu/silliness/burrito_monads.pdf
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Anuradha Laxminarayan writes:
> seq f g x = f (\s1 -> g x s1)
> because naming conventions imply that h is function.
Also if this operation is what it looks like, it's usually called
"bind". seq is something else entirely.
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If you're just getting started and you're not trying to make something
super slick, I'd suggest Tkinter. It's easy to learn and use, you can
bang stuff together with it pretty fast, it's included with various
Python distributions so you avoid download/installation hassles, and
it's pretty portable
he site I want to access uses CSS/JavaScript).
Is there any good option for this, or would I be better looking elsewhere for a
solution? I could probably work out how to knock something up using .NET, or a
HTA file, for example, I'm just more comfortable coding in Python.
Thanks,
Paul
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On 19 October 2016 at 12:10, Phil Thompson wrote:
> The Chrome-based QWebEngineView (http://doc.qt.io/qt-5/qwebengineview.html)
> is fully supported by PyQt.
Nice. Thanks for the pointer. Looks like the various bits of advice I
found on the web are a little out of date, is all.
Cheers
t
I'll take a closer look - it may be that I'm not clear on what they are doing
(pretty certain, I've barely any experience with what's available for Python
outside of command line applications).
Thanks,
Paul
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pozz writes:
> I have a dictionary where the keys are numbers: ...
Python 2.7.5:
>>> mydict = { 1: 1000, 2: 1500, 3: 100 }
>>> keydict = { 1: "apples", 2: "nuts", 3: "tables" }
>>> newdict = dict((keydict[k],v) for k,v in mydict.items())
>>> print newdict
{'tables': 100, 'nut
pozz writes:
> Is there a visual GUI builder for Tkinter?
Not that I know of. I haven't felt I needed one. I generally draw my
intended UI on paper and then use the Tk grid layout gadget.
> Could you explain better what do you mean with "industrial-looking
> UI"?
Something that doesn't have
Peter Otten <__pete...@web.de> writes:
> assert len(keydict) == len(mydict)
assert set(keydict) == set(mydict)
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jlada...@itu.edu writes:
> ... I find myself asking why Python doesn't include a standard,
> non-blocking keyboard input function. I have often wanted one myself.
I agree this would be useful. Forth has a standard word KEY to read a
key, and I used it in a simple game that I wrote a few months a
Terry Reedy writes:
> Today, ethernet-connected *nix servers have no
> keyboard, mouse, or even a directly connected terminal.
Usually you ssh into them and connect to a pty which supports the same
ioctls that a real terminal would. I use screen editors over ssh all
the time, not to mention filt
Adam Jensen writes:
> So what are some of the more successful distributed. multi-platform,
> development models?
Use an orchestration program to keep the systems in sync: I use ansible
(ansible.com) which is written in Python and fairly simple once you get
used to it, but there are lots of other
devers.meetthebadger.ja...@gmail.com writes:
> http://imgur.com/a/rfGhK#iVLQKSW ...
> So far this is my best shot at it (the problem with it is that the n
> that i'm subtracting or adding in the if/else part does not represent
> the element's position...
Right, so can you figure out the element's
arthurhavli...@gmail.com writes:
> I would gladly appreciate your returns on this, regarding:
> 1 - Whether a similar proposition has been made
> 2 - If you find this of any interest at all
> 3 - If you have a suggestion for improving the proposal
Bleccch. Might be ok as a behind-the-scenes optim
-- Forwarded message --
From: Avijit Paul
Date: Mon, Nov 7, 2016 at 1:27 AM
Subject: About Installation.
To: python-list@python.org
Hello,
I installed python-3.6.0b2-amd64 on my Windows PC. Which is running on
64-bit system of Windows 8.1. The installation was successful. After
This can probably be cleaned up some:
from itertools import islice
from collections import deque
def ngram(n, seq):
it = iter(seq)
d = deque(islice(it, n))
if len(d) != n:
return
for s in it:
yield tuple(d)
d.popleft(
Ian Kelly writes:
> I'd use the maxlen argument to deque here.
Oh that's cool, it's a Python 3 thing though.
> Better to move the extra yield above the loop and reorder the loop
> body so that the yielded tuple includes the element just read.
Thanks, I'll give that a try.
>> if len(d)
Steven D'Aprano writes:
> if we knew we should be doing it, and if we could be bothered to run
> multiple trials and gather statistics and keep a close eye on the
> deviation between measurements. But who wants to do that by hand?
You might like this, for Haskell:
http://www.serpentine.com/cr
Steven Truppe writes:
> # here i would like to create a directory named after the content of
> # the title... I allways get this error:
> UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 2
The title has a à (capital A with tilde) character in it, and there is
no corresponding
Gregory Ewing writes:
> I agree that f-strings are not to blame here. If we really want to
> avoid breaking anyone's ill-conceived attempts at sandboxing eval,
> we'd better not add anything more to the language, ever, because
> nobody can foresee all the possible consequences.
I'm surprised eval
Chris Angelico writes:
> Asynchronous I/O is something to get your head around I'd much
> rather work with generator-based async functions...
I haven't gotten my head around Python asyncio and have been wanting
to read this:
http://lucumr.pocoo.org/2016/10/30/i-dont-understand-asyncio/
Write a program which prints the sum of numbers from 1 to 101 ( 1 and 101 are
included) that are divisible by 5 (Use while loop)
This is the code:
x=0
count=0
while x<=100:
if x%5==0:
count=count+x
x=x+1
print(count)
Question: How does python know what count means ? I
Wildman writes:
> names = array.array("B", '\0' * bytes)
> TypeError: cannot use a str to initialize an array with typecode 'B'
In Python 2, str is a byte string and you can do that. In Python 3,
str is a unicode string, and if you want a byte string you have to
specify that explicitly, like
s DANGER are NAME tokens that aren't "n". That
seems pretty permissive...
While I agree that f-strings are more dangerous than people will immediately
realise (the mere fact that we call them f-*strings* when they definitely
aren't strings is an example of that), the problem
or users who are really uncomfortable with the command line) via a
GUI program and a dialog box.
But criticising the (entirely valid, simply different) choices of another OS
vendor as "dumb" isn't acceptable, nor is it a way to get to a solution to your
issue.
Paul
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but *radically* different to bash) Windows shell, try
Powershell. You'll probably hate it, but not because it's limited in
capabilities :-)
Paul
PS Apparently, powershell is now open source and available for Linux and OSX.
See https://github.com/PowerShell/PowerShell - although I do
chnically, it has to do some nasty internal juggling to preserve the argv,
but you don't need to care about that).
The program always gets a list of arguments. What *provides* that list to it
(the Unix shell, the C/Python runtime, or the caller of Popen) varies. And you
need (in more complex cases) to understand how the calling environment
constructs that list of arguments if you want to reason about behaviour.
Paul
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*need* to quote.
It's a trade-off. Unix makes shells do globbing, so programs don't have to, but
as a consequence they have no means of seeing whether globbing occurred, or
switching it off for particular argument positions. Windows chooses to make the
trade-off a different way.
Paul
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a C/application feature).
There's also an OS API to do cmdline->argv conversion, for programs that don't
want to rely on the C runtime capability.
The result is the same, though - in Windows, applications (or the language
runtime) handle globbing, but in Unix the shell does.
Paul
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ause the rules for text in an email are different from those for text in
a shell. But you seem to be arguing that the rules should be the same
everywhere, so maybe in your world, yes it should be. Most other people
understand the concept of context, though.
Paul
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On Tuesday, 6 December 2016 16:34:10 UTC, Michael Torrie wrote:
> On 12/06/2016 06:52 AM, BartC wrote:
> > Then you don't get utterly ridiculous and dangerous behaviour such as
> > the cp example Paul Moore came up with (that trumps most of mine actually):
>
> It'
nt isn't as true as you'd expect).
But claiming that special syntax is an issue because people who are unfamiliar
with it, are unfamiliar with it, is silly at best, and deliberate trolling at
worst.
Paul
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s here, so no possibility of "automatic
expansion", so this is bound to be completely safe[1].
Can you not see that danger is unrelated to the existence of globbing? Danger
is a result of people not knowing what the commands they type do.
Paul
[1] To anyone following along who isn
e standard in pipe is sufficient.
Agreed.
Paul
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clvanwall writes:
> I found that bsddb module was removed from Python3. Is there a
> replacement for it?
Try "dbm" which has a few options for the underlying engine.
Alternatively, try sqlite3.
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Wanderer writes:
> I also have a 433Mhz USB serial port jig from a TI development
> tool The TI USB port registers as a COM port that I can access
> with pySerial.
If the TI jig has 433 mhz (LORA?) at one end and serial at the other,
you have to find the port parameters in the docs for the TI
Skip Montanaro writes:
> Does the lack of a physical ESC key create problems for people, especially
> Emacs users?
Not a Mac user and I rarely use ESC instead of ALT while editing with
Emacs on a local computer, but when editing remotely I do have to use
ESC because the Gnome terminal emulator st
n a case where
this gets truncated) and then treating each entry as a record and parsing it
individually. But the resulting code isn't exactly maintainable, and I'm
looking for something cleaner.
Does anyone have any suggestions for a good way to parse this data?
Thanks,
Paul
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ee text). I'm OK with ignoring the possibility that the free text
contains something that looks like a timestamp.
The only problem with this approach is that I have more data than I'd really
like to read into memory all at once, so I'd need to do some sort of streamed
match/spli
Paul Moore writes:
> I'm looking for a reasonably "clean" way to parse a log file that
> potentially has incomplete records in it.
Basically trial and error. Code something reasonable, run your program
til it crashes on a record that it doesn't know what to do with,
Hi John,
there is a nice short article by E. W. Dijkstra about why it makes sense
to start numbering at zero (and exclude the upper given bound) while
slicing a list. Might give a bit of additional understanding.
http://www.cs.utexas.edu/users/EWD/ewd08xx/EWD831.PDF
- paul
http
Malik Rumi writes:
> I just created a new venv using pyvenv from a 2.7 install. Now I am shocked to
> see that I can get both 2.7 and 3.4 in this same venv:
>
> (memory) malikarumi@Tetuoan2:~/Projects/cannon/New2.7Projects/memory$ python
> Python 2.7.12 (default, Nov 19 2016, 06:48:10)
> [GCC 5.
> "Salted hashing (or just hashing) with BLAKE2 or any other
> general-purpose cryptographic hash function, such as SHA-256, is not
> suitable for hashing passwords. See BLAKE2 FAQ for more information."
>
> I propose to ignore this warning. I feel that, for my purposes, the
> above procedure is ad
Chris Angelico writes:
> Solution: Don't use dictionary-attackable passwords.
If you allow people to choose their own passwords, they'll too-often
pick dictionary-attackable ones; or even if they choose difficult ones,
they'll use them in more than one place, and eventually the weakest of
those
Steve D'Aprano writes:
> You say that as if two-factor auth was a panacea.
Of course it's not a panacea, but it helps quite a lot.
> That's the sort of thinking that leads to: ...
Beyond that, web browsers are the new Microsoft Windows with all of its
security holes and bloat and upgrade treadm
Chris Angelico writes:
> Correct. However, weak passwords are ultimately the user's
> responsibility, where the hashing is the server's responsibility.
No, really, the users are part of the system and therefore the system
designer must take the expected behavior of actual users into account.
The
Chris Angelico writes:
> as a sysadmin, I have lots of control over the hashing, and very
> little on passwords. I could enforce a minimum password length, but I
> can't prevent password reuse, and I can't do much about the other
> forms of weak passwords.
Right, 2FA helps with re-use, and diffic
Peter Pearson writes:
> I don't know any definition of "matrix range" that fits this description.
> Is it possible that someone means "rank"?
Yes, the rank is the dimension of the range unless I'm mistaken. I
think rank is what was meant.
To find the rank with Gaussian elimination, I guess you
Steve D'Aprano writes:
> Again, assume both operands are in range for an N-bit signed integer. What's
> a good way to efficiently, or at least not too inefficiently, do the
> calculations in Python?
My first thought is towards the struct module, especially if you want to
handle a bunch of such in
"Deborah Swanson" writes:
> I'm still wondering if these 4 lines can be collapsed to one or two
> lines.
In the trade that's what we call a "code smell", a sign that code
(even if it works) should probably be re-thought after taking a step
back to understand what it is really trying to do.
What
Tim Johnson writes:
> * Antonio Caminero Garcia [170102 20:56]:
>> Guys really thank you for your answers. Basically now I am more
>> emphasizing in learning in depth a tool and get stick to it so I
>> can get a fast workflow. Eventually I will learn Vim and its
>> python developing setup, I kno
"Deborah Swanson" writes:
>
> I didn't try printing them before, but I just did. Got:
>
print([Example](http://www.example.com)
>
> SyntaxError: invalid syntax (arrow pointing at the colon)
>
With respect, if you typed that at python then it's probably a good idea
to take a step b
"Deborah Swanson" writes:
> I'm still wondering if these 4 lines can be collapsed to one or two
> lines.
In the trade that's what we call a "code smell", a sign that code (even if it
works) should probably be re-thought after taking a step back to understand
what it is really trying to do.
Wha
Steve D'Aprano writes:
> Again, assume both operands are in range for an N-bit signed integer. What's
> a good way to efficiently, or at least not too inefficiently, do the
> calculations in Python?
My first thought is towards the struct module, especially if you want to handle
a bunch of such i
Tim Johnson writes:
> * Antonio Caminero Garcia [170102 20:56]:
>> Guys really thank you for your answers. Basically now I am more
>> emphasizing in learning in depth a tool and get stick to it so I
>> can get a fast workflow. Eventually I will learn Vim and its
>> python developing setup, I kno
"Deborah Swanson" writes:
>
> I didn't try printing them before, but I just did. Got:
>
print([Example](http://www.example.com)
>
> SyntaxError: invalid syntax (arrow pointing at the colon)
>
With respect, if you typed that at python then it's probably a good idea to
take a step back and
Tim Johnson writes:
> * Antonio Caminero Garcia [170102 20:56]:
>> Guys really thank you for your answers. Basically now I am more
>> emphasizing in learning in depth a tool and get stick to it so I
>> can get a fast workflow. Eventually I will learn Vim and its
>> python developing setup, I kno
Peter Otten <__pete...@web.de> writes:
> How would you implement stopmin()?
Use itertools.takewhile
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Jussi Piitulainen writes:
>> Use itertools.takewhile
> How? It consumes the crucial stop element:
Oh yucch, you're right, it takes it from both sides. How about this:
from itertools import takewhile, islice
def minabs(xs):
a = iter(xs)
m = min(map(abs,takewhile(lambda x:
Jussi Piitulainen writes:
> That would return 0 even when there is no 0 in xs at all.
Doesn't look that way to me:
>>> minabs([5,3,1,2,4])
1
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Paul Rubin writes:
> seems to work, but is ugly. Maybe there's something better.
def minabs2(xs):
def z():
for x in xs:
yield abs(x), x
if x==0: break
return min(z())[1]
is the same thing but a little bit nicer.
-
Paul Rubin writes:
> Doesn't look that way to me:
> >>> minabs([5,3,1,2,4])
> 1
There's a different problem though:
>>> minabs([1,2,3,0])
1
I think Python's version of iterators is actually buggy and at least the
first element of th
"Deborah Swanson" writes:
> Peter Otten wrote, on January 08, 2017 3:01 AM
>>
>> columnA = [record.A for record in records]
>
> This is very neat. Something like a list comprehension for named tuples?
Not something like - this *is* a list comprehension - it creates a list
of named tuples.
The
Peter Otten <__pete...@web.de> writes:
> return min(take_until(), key=firstitem)[1]
Actually, key=abs should work. I realized that after posting.
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Jussi Piitulainen writes:
> It could still be added as an option, to both takewhile and iter(_, _).
That's too messy, it really should be pervasive in iterators.
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Steven D'Aprano writes:
> [(expensive_calculation(x), expensive_calculation(x) + 1) for x in data]
def memoize(f):
cache = {}
def m(x):
if x in cache:
return cache[x]
a = f(x)
cache[x] = a
r
Serhiy Storchaka writes:
> gen = (expensive_calculation(x) for x in data)
> result = [(tmp, tmp + 1) for tmp in gen]
result = [(tmp, tmp+1) for tmp in map(expensive_calculation, data)]
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Tim Chase writes:
>> result = [(tmp, tmp+1) for tmp in map(expensive_calculation, data)]
>
> As charmingly expressive as map() is, the wildly different behavior in
> py3 (it's a generator that evaluates lazily) vs py2 (it consumes the
> entire iterable in one go) leads me to avoid it in general,
Ben Bacarisse writes:
> [(lambda tmp: (tmp, tmp+1))(expensive_calculation(x)) for x in data]
Nice. The Haskell "let" expression is implemented as syntax sugar for
that, I believe.
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Steven D'Aprano writes:
> Is it silly to create an enumeration with only a single member?
No.
> That is, a singleton enum?
Why stop there? You can make empty ones too. (Zerotons?)
> The reason I ask is that I have two functions that take an enum
> argument.
Sounds like a good reason.
>
ly my
preferences would be the explicit loop, then the intermediate_tuple function,
in that order.
Paul
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ith the stdlib enum? But rather that it's specific to your aenum
module? I don't see any documentation for the "init" parameter in either
version, so I'm a little puzzled.
The capability seems neat, although (as is probably obvious) the way you
declare it seems a little confusing to me.
Paul
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On Tuesday, 10 January 2017 15:47:20 UTC, Paul Moore wrote:
> On Saturday, 7 January 2017 19:14:43 UTC, Ethan Furman wrote:
> > Ya know, that looks an /awful/ lot like a collection! Maybe even an Enum?
> > ;)
> >
> > -- 8< --
pt the limitation, and it's possible to somehow
determine from the OS what it allows, then getting virtualenv to warn if you
use a "too long" pathname might be an alternative solution.
Paul
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urces to ensure I remembered that right. Also your pip
wheel would need to be a higher version than the embedded one, or it would get
ignored).
Paul
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Chris Angelico writes:
> decoding JSON... the scanner, which steps through the string and
> does the actual parsing. ...
> The only way for it to be fast enough would be to have some sort of
> retainable string iterator, which means exposing an opaque "position
> marker" that serves no purpose oth
Chris Angelico writes:
> You can't do a look-ahead with a vanilla string iterator. That's
> necessary for a lot of parsers.
For JSON? For other parsers you usually have a tokenizer that reads
characters with maybe 1 char of lookahead.
> Yes, which gives a two-level indexing (first find the stra
Joaquin Alzola writes:
> This email is confidential and may be subject to privilege. If you are not the
> intended recipient, please do not copy or disclose its content but contact the
> sender immediately upon receipt.
Probably best not to send it to a publicly accessible mailing list
then :/
-
the behaviour or not), so I don't think there's much benefit to
proposing changes to the docs alone.
Paul
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I've created a command line utility for managing text files. It's written in
Python:
https://github.com/paul-wolf/yewdoc-client
It makes heavy use of the fantastic Click module by Armin Ronacher:
http://click.pocoo.org/5/
This can be thought of in different ways:
* A micro-wiki
On Tuesday, 31 January 2017 23:39:41 UTC, Ben Finney wrote:
> The Python community has a stronger (?) preference for reStructuredText
> format. Can that be the default?
>
> That is, I want my text files to be named ‘foo’ (no suffix) or ‘foo.txt’
> (because they're primarily text), and have the d
fairly common for backing up and rewriting a progress line in
simple console programs:
for i in range(100):
print(f"\r \rCompleted: {i}%", end='')
sleep(0.5)
Paul
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> def triples():
> for total in itertools.count(1):
> for i in range(1, total):
> for j in range(1, total - i):
> yield i, j, total - (i + j)
Mathematically, that's the usual generalisation of Cantor's diagonal argument.
Paul
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tat information, so it's possible that if
you're creating the file and then relatively quickly doing the import,
there may be some cache effect going on (granularity of file
modification timestamps?) I don't know the details, but it might be
worth looking in that area...
Paul
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On 13 March 2018 at 11:01, Steven D'Aprano
wrote:
> On Sat, 10 Mar 2018 11:15:49 +0000, Paul Moore wrote:
>
>> On 10 March 2018 at 02:18, MRAB wrote:
> [...]
>>> This might help, although the order they come out might not be what you
>>> want:
>&
Use pip freeze rather than pip list. That will give you the
information in "requirements file" format that pip install -r can
read.
Paul
On 14 March 2018 at 23:20, Tim Johnson wrote:
> I'm currently running both python and python3 on ubuntu 14.04.
> Plan is to do a complete
only
worthwhile if you're in an extremely tight loop. So while it's OK to
use a borrowed reference, the reality is that if you don't fully
understand why you want to, and all the trade-offs, it's probably not
worth the risk.
Or, to put it another way, "if you need to ask, you can't afford to".
Paul
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Hi,
You don't need a regexp for this, the "replace" method on a string
will do what you want:
>>> s = 'this is a [string'
>>> print(s.replace('[', '\\['))
this is a \[string
Paul
On 21 March 2018 at 10:44, wrote:
> Hi,
>
&g
lues are conceptually text and which are conceptually bytes.
In my view one of the easiest ways of doing this is to try writing the
code you want in Python 3, and watch how it breaks (as you've
demonstrated above, it will!) Then, if you need your code to work in
Python 2, apply the knowledge yo
bj' object has no attribute 'x'
See https://docs.python.org/3.6/reference/datamodel.html#slots
IIRC, most built in objects (of which object is one) behave as if they
have __slots__ set (they don't actually, because they are written in
C, but the effect is the same).
Paul
On 26 March 2018 at
/warehouse/issues if you think it's worth
changing. (Same is true of your comment about the site design,
although I suspect it's a bit late for that to be changed in the
immediate future - the site design has been basically unchanged since
very early in the redesign. Personally, I agree it&#
On 27 March 2018 at 10:48, Paul Moore wrote:
> Same is true of your comment about the site design,
> although I suspect it's a bit late for that to be changed in the
> immediate future - the site design has been basically unchanged since
> very early in the redesign. Personall
Use re.X - see https://docs.python.org/3.6/library/re.html#re.X for details.
On 27 March 2018 at 15:17, Ganesh Pal wrote:
> Hello Python friends,
>
> How do I split the below regex , so that it fits within the character
> limit of 79 words
>
>
> pattern = [
> r'(?P([0-9a-fA-F]+:[0-9a-fA-F]+:[0-
statement on python:
>>>h.Execute ("run('H:\rishika\MATLAB\filewrite.m')")
uses unescaped backslashes, so \r is getting seen as Carriage Return
in the string being sent to Matlab. The \f will also be seen as a form
feed. I imagine that would confuse Matlab.
You should either double the backslashes
>>>h.Execute ("run('H:\\rishika\\MATLAB\\filewrite.m')")
or use raw strings
>>>h.Execute ("run(r'H:\rishika\MATLAB\filewrite.m')")
Paul
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s file (if you don't already have one), then "pip wheel -r
" to get a complete set of wheels for your
virtualenv. Then ship those wheels to the target machine (caveats
about exactly the same architecture still apply, as the wheels you
build may be architecture-specific), and build a n
page cluttered with category filters, if I need then I'll go to
the dedicated browse page.
Just my 2p worth...
Paul
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On 30 March 2018 at 16:45, Terry Reedy wrote:
> https://www.jetbrains.com/research/python-developers-survey-2017/
> “Which version of Python do you use the most?”
> 2014 80% 2.x, 20% 3.x
> 2016 60% 2.x, 40% 3.x
> 2017 25% 2.x, 75% 3.x
>
> This is a bigger jump than I anticipated.
Nice!
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ly grateful to everyone in the community
for their contributions.
Thanks,
Paul
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ot;)
>
> and run:
> py a.py > a.txt
>
> I get some gibberish in the file.
> So it is probably a global issue. Nothing works in this life :)
That actually sounds more like a redirection issue. Redirecting in the
cmd shell uses the OEM codepage, I believe, and Python outputs to a
pipe using the ANSI codepage, IIRC (I'd have to check to be certain).
Paul
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