ary minus and - for binary
subtraction, and doesn't include unary plus. The reason was to simplify the
parser, so that every symbol had exactly one meaning.
So in an alternate universe where Guido was less influenced by C, or where
he wasn't as good as writing parsers as the real GvR
e installer doesn't run, you will probably get a bunch of error
messages printed to the terminal window. COPY and PASTE those error
messages, and send them to us here. Don't re-type them, and don't try to
summarise. We need to see the EXACT messages.
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print(i)
One you get that far, you will need to decide which numbers are multiples of
3, which are multiples of 5, and which are multiples of both 3 and 5. Hint:
# Multiples of 7.
for i in range(1, 11):
print(i)
if i % 7 == 0:
print("multiple of seven")
If you n
On Sun, 15 Nov 2015 02:43 am, Ian Kelly wrote:
> On Fri, Nov 13, 2015 at 10:40 PM, Steven D'Aprano
> wrote:
>> Python has operator overloading, so it can be anything you want it to be.
>> E.g. you might have a DSL where +feature turns something on and -feature
>&g
On Mon, 16 Nov 2015 05:15 pm, Gregory Ewing wrote:
> Ian Kelly wrote:
>> Unary integer division seems pretty silly since the only possible results
>> would be 0, 1 or -1.
>
> Ints are not the only thing that // can be applied to:
>
> >>> 1.0//0.01
> 99.0
these two slices are the
same:
a[0:10:2]
a[:10:2]
If the start or end position are out of range, the slice will only include
positions that actually exist:
py> a[:10000:5]
[100, 105, 110, 115, 120]
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e-internet-nobody-can-tell-if-your-name-really-is-Mxyzptlk-ly yr's,
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st(). See example below.
Here is a generator which takes a list as argument, and returns a running
sum of the list values:
def running_sum(alist):
total = 0
for value in alist:
total += value
yield total
And here is an example of using it:
py> gen = running_sum(
On Sun, 15 Nov 2015 01:23 pm, Chris Angelico wrote:
> On Sun, Nov 15, 2015 at 1:08 PM, Steven D'Aprano
> wrote:
>> number = +raw_input("enter a number: ")
>>
>> versus:
>>
>> text = raw_input("enter a number: ")
>> try:
>>
'not where'])" "x in S"
1000 loops, best of 3: 0.101 usec per loop
That's better! But only *marginally* faster than the tuple, and to get the
speed increase you have to factor out the set into a constant.
So for Python 2, I would say that tuples are the clean winner,
On Wed, 18 Nov 2015 11:40 pm, Chris Angelico wrote:
> On Wed, Nov 18, 2015 at 10:37 PM, Steven D'Aprano
> wrote:
>> How about Python 3? Python 3 has the advantage of using set literals.
>
> 2.7 has set literals too.
Ah, so it does. I forgot about that. Most of my code
thful to say and write, often gets abbreviated as "astral planes". Hence
the characters themselves are called "astral characters".
Even today, some programming languages and systems have difficulty dealing
with characters that require more than two bytes.
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ject with TWO names:
py> a = [1, 2, 3, 4]
py> b = a
py> b.append(999)
py> print(a)
[1, 2, 3, 4, 999]
If we delete one of those names, the other name keeps the list alive:
py> del a
py> print(b)
[1, 2, 3, 4, 999]
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is
responsible for ensuring that x is not deleted. If it is deleted, then you
will get a NameError trying to evaluate the default value.
Whichever option you choose, there will be a multitude of people on the
internet telling you that you got it wrong.
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dict, a float, or some other instance,
the behaviour is the same: the default value is the specific instance which
the default expression evaluates to when the function is created.
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On Fri, 20 Nov 2015 12:19 am, BartC wrote:
> On 19/11/2015 12:19, Steven D'Aprano wrote:
>> On Thu, 19 Nov 2015 10:14 am, BartC wrote:
>
>> Consider this pair of functions:
>>
>>
>> def expensive():
>> # Simulate some expensive c
t
*copying the reference* to B, not copying B.
[Aside: there is some ambiguity here. If I say "a reference to B", I
actually mean a reference to the object referenced to by B. I don't mean a
reference to the *name* B. Python doesn't support that feature: names are
not values in Python.]
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executed only once. The function body, conveniently indented to make it
stand out:
y = []
is executed every time you call the function.
[Aside: that nice clean design is somewhat muddied by docstrings. Despite
being indented, docstrings are actually part of the declaration in the
On Fri, 20 Nov 2015 04:30 am, BartC wrote:
> On 19/11/2015 16:01, Steven D'Aprano wrote:
[...]
> The whole concept of 'mutable' default is alien to me. A default is just
> a convenient device to avoid having to write:
>
>fn(0) or fn("") or fn([])
Sa
andom.randrange(10) produces a random digit between 0 and 9
(10 is excluded). So we end up with something like:
[6, 4, 2, 2, 6, 9]
for example.
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On Sun, 22 Nov 2015 12:20 am, Cai Gengyang wrote:
> Does bill *= 1.08 mean bill = bill * 1.15 ?
No. It means `bill = bill * 1.08`, not 1.15.
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On Fri, 20 Nov 2015 10:59 pm, BartC wrote:
> On 20/11/2015 01:05, Steven D'Aprano wrote:
>> Here's another use for function defaults, as static storage:
[...]
>> This is a quick and easy way to memoise a function which would otherwise
>> be horribly slow. And it on
On Fri, 20 Nov 2015 02:42 am, Ian Kelly wrote:
> On Thu, Nov 19, 2015 at 5:45 AM, Steven D'Aprano
> wrote:
>> But if you want the default value to be evaluated exactly once, and once
>> only, there is no real alternative to early binding. You could use a
>> global
y(query, database=global_database):
...
global_database = DB("xyz")
initiate_query(query) # here, the database used is "abc", not "xyz"
But with late binding, or "late evaluation", the opposite is the case: when
you finally call initiate_query, the dat
ied response to make when multiple
people have spent a lot of their own time, gratis, to explain what is going
on. If you are willing, you can learn a lot here, one of the few places
left where education is still free.
> * The insistence (I think largely from Steven) that the way this feature
> w
r and more
general concept than roasting."
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On Monday 23 November 2015 10:43, Gregory Ewing wrote:
> Steven D'Aprano wrote:
>> Memoisation isn't "esoteric", it is a simple, basic and widely-used
>> technique used to improve performance of otherwise expensive functions.
>
> That may be true, but I d
ing SUSE for breaking this, please run this at the interactive
interpreter:
import urllib2
print urllib2.__file__
Have you perhaps accidentally shadowed the std lib module?
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On Mon, 23 Nov 2015 09:40 pm, BartC wrote:
> On 23/11/2015 07:47, Steven D'Aprano wrote:
>
>> I think it would be cleaner and better if Python had dedicated syntax for
>> declaring static local variables:
>
> Interesting. So why is it that when /I/ said:
>
&
opposite. Fortunately, it is very simple to test these things out at the
interactive interpreter. I cannot imagine doing any Python programming
without having a Python shell open and ready for me to try out code
snippets.
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ot;: 13}
> }
>
> How do you get gengyang's maths scores ?
Break the problem into two steps:
- get Gengyang's scores;
- then get the maths score:
scores = results['gengyang']
maths_score = scores['maths']
Now you can simplify the process:
maths_score = results['gengyang']['maths']
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On Thu, 05 Jun 2014 14:01:50 +1200, Gregory Ewing wrote:
> Steven D'Aprano wrote:
>> The whole concept of stdin and stdout is based on the idea of having a
>> console to read from and write to.
>
> Not really; stdin and stdout are frequently connected to files, or pipes
tified.
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On Thu, 05 Jun 2014 05:56:07 -0700, Rustom Mody wrote:
> On Thursday, June 5, 2014 2:09:34 PM UTC+5:30, Steven D'Aprano wrote:
>> On Wed, 04 Jun 2014 22:43:05 -0400, Terry Reedy wrote:
>
>> > Many mail readers treat \t as a null char since it actually has no
>> &g
*. In the Unix world, text formats and text
processing is much more common in user-space apps than binary processing.
Perhaps the definitive explanation and celebration of the Unix way is
Eric Raymond's "The Art Of Unix Programming":
http://www.catb.org/esr/writings/taoup/html/
n't libel Python
by pretending that bytes is anything less than one of the most important
and fundamental types in the language. bytes are so important that there
are TWO implementations for them, a mutable and immutable version
(bytearray and bytes), while text strings only have an immut
hatever the situation, and despite our differences of opinion about
Unicode, THANK YOU for having updated ReportLabs to 3.3.
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example, the amount of space spent on fixing
Windows Unicode handling here:
http://www.utf8everywhere.org/
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bject to str implicitly
[...]
>> When I compile Cython modules I use LLVM on this computer.
>
> Cython is not Python, it is another language, with an incompatible
> syntax.
Cython is best considered a superset of Python, with a pure-Python
compatibility mode. It can run standard Python c
riendly, but it's
conceptually simple:
* Does sys.stdout have a buffer attribute? Then write raw bytes to
the buffer.
* If not, then write raw bytes to sys.stdout.
* If either fails, then somebody has replaced stdout with something
weird, and they deserve whatever horrible fate their
e go so far as to say that weakly typed is a meaningless
concept, but I would agree that there are degrees of weakness.
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s a language feature: within limits,
instances can change their type. It has been around for a long, long
time, back to Python 1.5 or older, and it has real-world use-cases:
http://code.activestate.com/recipes/68429-ring-buffer/
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cal is a "bondage and discipline" language, while C lets you escape
from the discipline of types with the freedom of casts and other
dangerous weak-typing features.
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the file.
In binary mode, newlines are *never* changed.
In Python 3, you can return end-of-lines unchanged by passing newline=''
to the open() function.
https://docs.python.org/2/library/functions.html#open
https://docs.python.org/3/library/functions.html#open
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On Fri, 06 Jun 2014 02:21:54 +0300, Marko Rauhamaa wrote:
> Steven D'Aprano :
>
>> In any case, I reject your premise. ALL data types are constructed on
>> top of bytes,
>
> Only in a very dull sense.
I agree with you that this is a very dull, unimportant sens
f bytes in some encoding, but as an
array of code points. Eventually the abstraction will leak, all
abstractions do, but not for a very long time.
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ot;self" as normal, and such references won't be evaluated until call-
time when self exists. It's only inside the decorator itself, and the
body of the class, that self doesn't yet exist.
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fundamental model is very similar to Objective-C, Python's is not. Apple
already developed a version of Ruby, "MacRuby", which was designed to
call directly into the Objective-C APIs without an intermediate interface
layer, but they have abandoned that to focus on Swift.
(Besides, Apple is unlikely to commit to a core language being something
they don't control.)
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at is sig? You've said it is a local variable, and at this point it
doesn't have a value yet.
Lua allows you to do this:
sig = sig[0]
will look up a global sig and assign it to the local sig first, but that
can be confusing and Python doesn't do that.
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ile it is true that the G4 was classified as a supercomputer, that was
only for four months until the Clinton administration changed the laws.
Apple, of course, played that for every cent of advertising as it could.]
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C is not a safe language, and code written in C is not safe. Using C for
application development is like shaving with a cavalry sabre -- harder
than it need be, and you're likely to remove your head by accident.
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for a 50% reduction in my electricity bill.
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s air-
cooling. The last mass market car that used it, the Citroën GS, ceased
production in 1986. The Porsche 911 ceased production in 1998, making it,
I think, the last air-cooled vehicle apart from custom machines. With the
rise of all-electric vehicles, perhaps we will see a return to ai
ot sure how this sort of design ambiguity is fixed by
importing names into the current namespace.
(Note that Forth is brilliant here, as it exposes the argument stack and
gives you a rich set of stack manipulation commands.)
While we're talking about chaining method and function calls, I&
if __name__ == '__main__':
return "NOBODY expects the Spanish Inquisition!"
else:
return __name__
raise AttributeError("no attribute %r" % name)
:-)
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On Sun, 08 Jun 2014 19:24:52 -0700, Rustom Mody wrote:
> On Monday, June 9, 2014 7:14:24 AM UTC+5:30, Steven D'Aprano wrote:
>> The fact that CPUs need anything more than a passive heat sink is
>> *exactly* the problem. A car engine has to move anything up to a tonne
>>
ou have to do is just handle the cases you care about, and
return NotImplemented for everything else.
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On Mon, 09 Jun 2014 09:25:33 +0300, Marko Rauhamaa wrote:
> In a word,
> Python has predefined a handful of *generic functions/methods*,
That's nine words :-)
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On Sun, 08 Jun 2014 23:32:33 -0700, Rustom Mody wrote:
> On Monday, June 9, 2014 9:50:38 AM UTC+5:30, Steven D'Aprano wrote:
>> On Sun, 08 Jun 2014 19:24:52 -0700, Rustom Mody wrote:
>>
>>
>> > On Monday, June 9, 2014 7:14:24 AM UTC+5:30, Steven D'A
On Mon, 09 Jun 2014 19:13:40 +1000, Chris Angelico wrote:
> On Mon, Jun 9, 2014 at 7:09 PM, Steven D'Aprano
> wrote:
>> On Mon, 09 Jun 2014 09:25:33 +0300, Marko Rauhamaa wrote:
>>
>>> In a word,
>>> Python has predefined a handful of *generic funct
sed to swallow
a lot more exceptions than it does now, and order comparisons (less than,
greater than etc.) of dissimilar types used to return a version-dependent
arbitrary but consistent result (e.g. all ints compared less than all
strings), but in Python 3 that is now an error.
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x27;re doing something wrong, and told so.
This, I think, is the important factor. `x in somestring` is almost
always an error if x is not a string. If you want to accept None as well:
x is not None and x in somestring
does the job nicely.
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On Wed, 11 Jun 2014 06:37:01 +1000, Chris Angelico wrote:
> I don't know
> a single piece of programming advice which, if taken as an inviolate
> rule, doesn't at some point cause suboptimal code.
"Don't try to program while your cat is sleeping on the keyboard.
l-file his posts and be done.
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ater-cooled engines are really air-cooled too, just not
> by air flowing directly over the engine block. (Although marine engines
> may be an exception.))
Yes, technically water-cooled engines are cooled by air too. The engine
heats a coolant (despite the name, usually not water these days)
On Wed, 11 Jun 2014 19:41:12 +1200, Gregory Ewing wrote:
> Steven D'Aprano wrote:
>> Everything *eventually* gets converted to heat, but not immediately.
>> There's a big difference between a car that gets 100 miles to the
>> gallon, and one that gets 1 mile to t
On Wed, 11 Jun 2014 08:48:36 -0400, Roy Smith wrote:
> In article <[email protected]>,
> Steven D'Aprano wrote:
>
>> Yes, technically water-cooled engines are cooled by air too. The engine
>> heats a coolant (despite the na
On Wed, 11 Jun 2014 08:28:43 -0700, Rustom Mody wrote:
> Steven D'Aprano wrote:
>
>> Not the point. There's a minimum amount of energy required to flip a
>> bit. Everything beyond that is, in a sense, just wasted. You mentioned
>> this yourself in your previous
return y
This does not copy in reverse order. To make it copy in reverse order,
index should start at len(x) - 1 and end at 0.
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On Thu, 12 Jun 2014 12:16:08 +1000, Chris Angelico wrote:
> On Thu, Jun 12, 2014 at 12:08 PM, Steven D'Aprano
> wrote:
>> I'm just pointing out that our computational technology uses over a
>> million times more energy than the theoretical minimum, and therefore
&
On Thu, 12 Jun 2014 05:54:47 -0700, Rustom Mody wrote:
> On Thursday, June 12, 2014 2:36:50 PM UTC+5:30, Steven D'Aprano wrote:
[...]
>> > The laws of physics tend to put
>> > boundaries that are ridiculously far from where we actually work - I
>> > think most
http://code.activestate.com/recipes/577896
I'll clean it up and submit it on the bug tracker.
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On Fri, 13 Jun 2014 03:18:00 +1000, Chris Angelico wrote:
> On Fri, Jun 13, 2014 at 3:04 AM, Steven D'Aprano
> wrote:
[...]
>> Take three numbers, speeds in this case, s1, s2 and c, with c a strict
>> upper-bound. We can take:
>>
>> s1 < s2 < c
>>
Does anyone know any examples of values or types from the standard
library or well-known third-party libraries which satisfies
isinstance(a, numbers.Number) but not isinstance(a, numbers.Complex)?
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On Sun, 15 Jun 2014 02:51:49 +0100, Joshua Landau wrote:
> On 12 June 2014 03:08, Steven D'Aprano
> wrote:
>> We know *much more* about generating energy from E = mc^2 than we know
>> about optimally flipping bits: our nuclear reactions convert something
>> of the o
On Sun, 15 Jun 2014 01:22:50 -0600, Ian Kelly wrote:
> On Sat, Jun 14, 2014 at 8:51 PM, Steven D'Aprano
> wrote:
>> Does anyone know any examples of values or types from the standard
>> library or well-known third-party libraries which satisfies
>> isinstan
On Sun, 15 Jun 2014 13:28:44 -0400, Roy Smith wrote:
> In article <[email protected]>,
> Steven D'Aprano wrote:
>
>> On Sun, 15 Jun 2014 01:22:50 -0600, Ian Kelly wrote:
>>
>> > On Sat, Jun 14, 2014 at 8:51 PM, Steve
it all depends on him.
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free to show us your code (especially snippets) if
there is anything unclear.
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e a string by an int.
Perhaps you need to change the line to this?
dnsNB = int(data[268]) / 4
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,'8N1')
> AttributeError : set_speed
Do you have two files called SER, perhaps in different directories? One
contains set_speed function, the other does not?
You should rename one of the files. Also watch out for left-over SER.pyc
files, you should delete them.
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y2app installer.
Create a minimal script hello.py (as above)
Run py2app hello.py
The result is ... [whatever actually happens]
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File "", line 1
>>>
There's no lambda built-in, but there is a version in the standard
library!
def lambda(args, expr):
if '\n' in args or '\n' in expr:
raise RuntimeError, 'lambda: no cheating!'
stmt = '
one might last 2-3 months on a single
charge.
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, then explicitly round them:
py> x = sum([0.01]*6)
py> y = 0.06
py> round(x, 12) == round(y, 12)
True
Not that I'm recommending that you do it this way, but an explicit round
is better than using string formatting.
See also this:
http://randomascii.wordpress.com/20
On Tue, 24 Jun 2014 13:06:56 +0200, Johannes Bauer wrote:
> On 24.06.2014 03:23, Steven D'Aprano wrote:
>> http://www.iflscience.com/technology/new-type-computer-capable-
>> calculating-640tbs-data-one-billionth-second-could
>>
>> Relevance: The Machine uses *
gt; sum( [x]*23 ) == 1 # Surprise!
False
py> (Decimal(19)/Decimal(17))*Decimal(17) == 19 # Surprise!
False
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On Thu, 26 Jun 2014 13:13:45 +1000, Chris Angelico wrote:
> On Thu, Jun 26, 2014 at 12:56 PM, Steven D'Aprano
> wrote:
>> That's a myth. decimal.Decimal *is* a floating point value, and is
>> subject to *exactly* the same surprises as binary floats, except for
&g
On Thu, 26 Jun 2014 13:39:23 +1000, Ben Finney wrote:
> Steven D'Aprano writes:
>
>> On Wed, 25 Jun 2014 14:12:31 -0700, Maciej Dziardziel wrote:
>>
>> > Floating points values use finite amount of memory, and cannot
>> > accurately represent
On Thu, 26 Jun 2014 19:38:45 +1000, Chris Angelico wrote:
> On Thu, Jun 26, 2014 at 7:15 PM, Steven D'Aprano
> wrote:
>> Here's an error that *cannot* occur with binary floats: the average of
>> two numbers x and y is not guaranteed to lie between x and y!
>
is recommended for logging, if you expect
that logging will be faster than print, I expect you will be disappointed.
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PyPy may technically speed it up, but probably
not enough to notice.
Some problems are inherently slow. Some are fixable by using better
algorithms. And some are fixable by using an optimizing compiler like
PyPu or Nuitka. We are given no reason to think that the OP's problems
the actual path to your program.)
Confirm that your program is there: at the shell prompt, type
dir
then hit Enter, and make sure you see your program, something_or_other.py.
Now type
nuitka --recurse-all something_or_other.py
and hit Enter. What happens?
(Don't be discouraged if there are a bunch of errors.)
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On Sat, 28 Jun 2014 18:24:21 +0100, Mark Lawrence wrote:
[snip]
> Or get Python 3.4 which can get pip for you if you so desire.
Hey Mark, how about trimming your replies a little, please? Thanks.
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ic.com/writings/diary/archive/2007/06/01/lolpython.html
http://www.staringispolite.com/likepython/
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VCS, almost as good as hg, there's something about git culture
which attracts geek wankery.
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static typing. Some of the
features strike me as good ideas, such as contracts and unit tests, some
as dubious (there's a lot of changes to the syntax which, in my opinion,
hurt readability). But overall, it strikes me as a very exciting language.
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return value1
def post_test():
return 'POST it works'
> def get_test(value2):
> value2='GET it works'
def get_test():
return 'GET it works'
--
Steven
--
https://mail.python.org/mailman/listinfo/python-list
/design.html#why-am-i-getting-strange-results-with-simple-arithmetic-operations
http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html
http://effbot.org/pyfaq/why-are-floating-point-calculations-so-inaccurate.htm
http://blog.codinghorror.com/why-do-computers-suck-at-math/
https://ran
On Wed, 02 Jul 2014 19:59:25 +0300, Marko Rauhamaa wrote:
> Steven D'Aprano :
>
>> This is a problem with the underlying C double floating point format.
>> Actually, it is not even a problem with the C format, since this
>> problem applies to ANY floating point form
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