vendor lock-in.
What do you mean by "federated"?
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ield x + 1000
...
py> a = g()
py> next(a)
1
py> next(a)
2
py> next(a)
3
py> a.send(99)
1099
But don't do that.
So as far as Python is concerned, a coroutine is just a generator instance
which you use in a particular way, not a different kind of object. So I
would use similar terminology:
A generator function/factory returns a generator instance, which we use as a
coroutine, so we can call it a coroutine.
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ing (2.0.3)
> setuptools (12.0.5)
> six (1.9.0)
>
> And it works fine with Python 2.7.9.
>
> Is there some way to force the use of the pure Python pickle module?
Try renaming the _pickle module. This works on Linux:
mv /usr/local/lib/python3.3/lib-dynload/_pickle.cpython-33m.so
/usr/local/lib/python3.3/lib-dynload/_pickle.cpython-33m.so~
> My guess is that there's something about reusing "pickle" instances
> that botches memory uses in CPython 3's C code for "cpickle".
How are you reusing instances?
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reliably
>> with PyPi and pip?
>
> Google has been migrating most of its own open source projects to GitHub.
All that tells me is that Google is planning on buying GitHub, at which
point they will continue the process of GitHub lock-in.
http://nedbatchelder.com/blog/201405/github_mon
if I can possibly ignore it. I have ethical
issues with their corporate culture, and I dislike anything which smacks of
a monoculture. The more Github gets treated as synonymous with revision
control, the more I will push back, until I cannot push back any more.
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s += '0'
return s
And in use:
py> strip_zero('-10.2500')
'-10.25'
py> strip_zero('123000')
'123000'
py> strip_zero('123000.')
'123000.0'
It doesn't support exponential format:
py> strip_ze
fficult to pin-point where they come from. My wife and I can sit in the
same car, listening to the same noise, and she swears it is coming from the
front left and I'm sure its coming from the rear right. (Invariably she's
correct.)
But at least the car mechanic can jump in the ca
o what str(obj) returns. It's not
> much more than a random printable some CPython coder has cooked up in
> the heat of the moment.
I think that is completely wrong. The repr() and str() of generator
instances is hardly "random", it reflects the consensus of the PEP authors
and the Python core developers, in particular the BDFL Guido who approved
the PEP, that the type of object it is should be called "generator".
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Rustom Mody wrote:
> On Saturday, March 14, 2015 at 11:34:27 AM UTC+5:30, Steven D'Aprano
> wrote:
>>
>> A generator (function) may be a function which returns an iterator,...
>
> I find "generator-function" misleading in the same way that "pineappl
d. Or are you saying that a mere nine years isn't a long enough
> time period to do an exercise like this?
Mark, did you read John's post or just respond with a knee-jerk defence of
Python 3? I quote:
"Some of the bugs I listed are so easy to hit that I suspect those
packages aren't used much. Those bugs should have been found years
ago. Fixed, even. I shouldn't be discovering them in 2015."
Clearly a mere nine years is NOT long enough. Which is probably why the
Python core developers are supporting Python 2 until 2020. Library authors
will presumably be offering Python 2 compatibility for even longer.
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x = random.random()
Generators, as a rule, are significantly easier to write, understand, and
debug. There's nothing they can do that can't be done with an iterator
class, but the fiddly, unexciting bits related to halting and resuming and
saving state are all handled for you, allo
On Monday 16 March 2015 16:39, Chris Angelico wrote:
> On Mon, Mar 16, 2015 at 4:07 PM, Paul Rubin
> wrote:
>> Python 2 is by now pretty solid and its users don't feel like beta
>> testers any more. If you're saying using Python 3 by contrast means
>> "being first" and "reporting bugs", that bas
On Monday 16 March 2015 17:17, Paul Rubin wrote:
> Chris Angelico writes:
>> Ah but it isn't Py3 that's all about being first - it's the latest
>> version of some third-party module.
>
> You know, one of the attractions of Python used to be that it came with
> a powerful enough standard library
On Monday 16 March 2015 18:12, Marko Rauhamaa wrote:
> Steven D'Aprano :
>
>> Marko Rauhamaa wrote:
>>> What features do generator iterators provide on top of generic
>>> iterators?
>>
>> The biggest difference is syntactic. Here's an iterator
Chris Angelico wrote:
> On Mon, Mar 16, 2015 at 7:36 PM, Steven D'Aprano
> wrote:
>> I expect that the interpreter can tell the difference between
>>
>> yield spam
>>
>> and
>>
>> x = yield spam
>>
>> and only allow send
, and I expect that will give Py3 some more impetus.
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o iter([1,2,3]) ? Or
>> send it a value? What happens?
>
> I would expect iter([1, 2, 3]) to behave highly analogously to
> (x for x in [1, 2, 3]).
I believe that it is an unfortunate mistake that generators which aren't
coroutines support send. At the very least it is an ugly design wart, at
worst it is an outright bug.
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be honest, I'm not even sure what the use-case for close() on coroutines
is in the first place. If you don't want to send any more items into it,
just don't send any more items into it.)
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On Mon, 16 Mar 2015 07:31 pm, Paul Rubin wrote:
> Steven D'Aprano writes:
>> The std lib is *batteries* included. If you need a nuclear reactor, you
>> turn to third-party frameworks and libraries like Twisted, Zope, numpy,
>> PLY, etc.
>
> I always thought twi
] Methods are, of course, actually just functions under the hood. The
conversion to MethodType is done at method-lookup time, by the descriptor
protocol.
[2] I'm aware that they are instances. You know what I mean.
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On Mon, 16 Mar 2015 07:25 pm, Paul Rubin wrote:
> Steven D'Aprano writes:
>> It may, or may not, turn out that in hindsight there might have been
>> better ways to manage the Python2-3 transaction. Let's be honest, a lot
>> of the changes could have been introduce
hat whatever object is passed to you supports close(), or else it
is an error.
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On Tue, 17 Mar 2015 01:19 am, Rustom Mody wrote:
> On Monday, March 16, 2015 at 7:10:03 PM UTC+5:30, Steven D'Aprano wrote:
>> And of course, from a comp science theoretic perspective,
>> generators are a kind of subroutine, not a kind of type.
>
> You just showed Ma
On Tue, 17 Mar 2015 01:35 am, Steven D'Aprano wrote:
> On Tue, 17 Mar 2015 01:19 am, Rustom Mody wrote:
>
>> On Monday, March 16, 2015 at 7:10:03 PM UTC+5:30, Steven D'Aprano wrote:
>>> And of course, from a comp science theoretic perspective,
>>> generat
rgue that they can't install and use
Python3 because of the location where it is installed. As an application
developer, apart from ensuring that the PATH is setup correctly and maybe
having to adjust a few hash-bang lines, how does the location of the Python
binary affect you?
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On Tuesday 17 March 2015 03:23, candide wrote:
> Python 3.4 provides auto-completion facility within a Python console
> embedded in a command line terminal.
>
>
> But apparently this facility doesn't allow the user to complete with
> standard module name. For instance, editing the following :
>
On Tuesday 17 March 2015 14:33, Michael Torrie wrote:
> On 03/16/2015 09:04 PM, Mario Figueiredo wrote:
>> Are you saying this is a problem for any developer? Especially
>> considering this is a one-time operation...
>>
>> Or maybe you mean lazy developers. But lazy developers are an edge
>> case
On Tuesday 17 March 2015 12:46, Michael Torrie wrote:
> Python3 can be installed from Software Collections (and that is somewhat
> reasonable), but it won't integrate by default, so you can't use
> #!/usr/bin/python3 in your apps by default without altering the system
> paths.
If RedHat installs
On Tue, 17 Mar 2015 09:36 am, Paul Rubin wrote:
> Steven D'Aprano writes:
[...]
>> If we were designing Python from scratch today, here are some of the
>> changes we would certainly make: [mostly good changes]
>
> I agree with most of those changes and I'd add
On Tue, 17 Mar 2015 11:22 pm, Oscar Benjamin wrote:
> On 17 March 2015 at 08:10, Steven D'Aprano
> wrote:
>> On Tuesday 17 March 2015 03:23, candide wrote:
>>
>> You might like my tab completion and command history module:
>>
>> http://code.google.com/
int(u"\N{CYRILLIC CAPITAL LETTER ZE WITH DESCENDER}")
Ҙ
There are currently somewhere in the vicinity of 110 thousand such names.
Any interest?
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On Wednesday 18 March 2015 12:14, Dan Sommers wrote:
> On Wed, 18 Mar 2015 00:35:42 +, Mark Lawrence wrote:
>
>> I've just come across this
>> http://www.stavros.io/posts/brilliant-or-insane-code/ as a result of
>> this http://bugs.python.org/issue23695
>>
>> Any and all opinions welcomed, I
om Python 2.6
to 2.7 is just the normal upgrade pains you always have to expect from any
major project, but the two weeks we lost going from 2.7 to 3.3 is a sign
that Python 3 is a broken mistake!
Anyway, thanks John for persevering.
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dd_data(self):
try:
age = self.age_var.get()
except ValueError:
showinfo("Error:", "Please Enter A Number In Age Field.")
return # Return early, do nothing.
new_person = Employee(name=name, age=age, address=addr, city=city,
state=state, zip=zip, ssn=ssn, phone=phone,
cell=cell)
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flow they don't insist on you posting your
entire program. What if it is 100,000 lines of code split over twenty
files? I think they ask for the same as the SSCCE site above, a minimum
sample of code which they can run and see the error themselves.
Have you got a solution to your immediate
27;t use strings for comments anywhere else, this note pad area stands out
and reminds me to remove it before releasing the code into production.
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reversed...
with open(inname, "w") as outfile, open(outname, "r") as infile:
proc = Popen("cat", shell=True, stdout=outfile, stdin=infile)
# do stuff with proc
# when finished, save the stuff you care about
result = ...
print(result)
Outside of the `with
On Thu, 19 Mar 2015 03:35 am, Paul Rubin wrote:
> Steven D'Aprano writes:
>> The two weeks we lost upgrading from Python 2.6 to 2.7 is just the
>> normal upgrade pains you always have to expect from any major project,
>
> Wait, what happened between 2.6 and 2.7
On Friday 20 March 2015 14:47, Rustom Mody wrote:
> On Friday, March 20, 2015 at 9:05:19 AM UTC+5:30, Chris Angelico wrote:
>> On Fri, Mar 20, 2015 at 2:27 PM, Rustom Mody wrote:
>> > Numbers (not complex) satisfy the trichotomy law: ie for any 2 numbers
>> > x,y: x < y or x > y o x = y
>>
>> Re
gument, the tuple (a,b).
> So should I just abandon the idea that += could be used this way?
Yes, sorry.
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http://www.keacher.com/1216/how-i-introduced-a-27-year-old-computer-to-the-
web/
or http://tinyurl.com/ksqk5kt
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lement of the fraction if x is negative:
py> x = -2.75
py> x % 1
0.25
Are there any other, possibly better, ways to calculate the fractional part
of a number?
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; fib(3)
1 0 1 1 2
2
py> fib(5)
1 0 1 1 2 1 0 1 3 1 0 1 1 2 5
5
If you want to print a list of Fibonnaci values, you need to call the
function in a loop. Removing the "print result" line again, you can do
this:
py> for i in range(6):
... print fib(i),
...
0 1 1 2 3 5
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the Fibonacci series in practice,
what is mathematically straightforward is not always computationally
efficient.
The question is, just how inefficient is is? How many calls to `fib` are
made in calling fib(n)?
Answer to follow.
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ecursive algorithm is ... the nth Leonardo Number. So in a way,
we need not actually bother calculating anything, but just count the number
of function calls, throwing away the intermediate results! I think that is
rather neat.
http://en.wikipedia.org/wiki/Leonardo_number
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ssociated sequences -- Fibonacci
numbers, Pell numbers, Leonardo numbers, Perrin numbers and others -- are
defined as recurrences, i.e. recursively. But that doesn't necessarily make
recursion the best way to implement it.
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iables. The docstring has to be
associated with an object, and only certain objects at that.
That applies to documentation which is introspectable at runtime. But of
course you can do anything you like by parsing the source code! It may be
that the docutils library will parse the source code and e
request for an application which is
usable by Python, it is off-topic and spam.
I see Calibre is a Python application, not sure if it is importable by
Python scripts though.
Thank you,
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sages you
are given, you are truly going to struggle as a programmer.
Read the error message. If you don't understand the error message, please
say so.
And choose a relevant subject line: this has nothing to do with regexes. You
might as well have called it "Import Python Help".
unless they have an internet connection."
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On Wednesday 25 March 2015 14:13, [email protected] wrote:
> I have a list containing 9600 integer elements - each integer is either 0
> or 1.
>
> Starting at the front of the list, I need to combine 8 list elements into
> 1 by treating them as if they were bits of one byte with 1 and 0
On Wed, 25 Mar 2015 10:39 pm, Marko Rauhamaa wrote:
> I have yet to find practical use for fibonacci numbers.
Many people have failed to find practical uses for many things from
mathematics. Doesn't mean they don't exist:
http://en.wikipedia.org/wiki/Fibonacci_number#Applications
ly in this thread you said
"Here you go. Windows shell was easier!!!"
Does Windows shell have grep? How about Powershell? If grep is available,
why mix two different languages?
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th time and
datetime from the same module. I usually only import one, or the other. For
example, I might do:
time.sleep(3)
which doesn't require the datetime module.
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al with that. In order from best to worst:
(1) Don't let those combinations occur at all. Redesign your function, or
split it into multiple functions, so the impossible combinations no longer
exist.
(2) Raise an error when an impossible combination occurs.
(3) Just ignore one or more argument s
re not wanted here.
*plonk*
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On Thu, 26 Mar 2015 08:47 pm, Ivan Evstegneev wrote:
>
>
>> -Original Message-
>> From: Python-list [mailto:python-list-
>> [email protected]] On Behalf Of Steven
>> D'Aprano
>> Sent: Thursday, March 26, 2015 01:49
>
On Fri, 27 Mar 2015 02:33 am, Joel Goldstick wrote:
[...]
Don't give the troll the attention he craves. He has as much told us that he
is beyond reason -- he's been trolling for years, you don't need to justify
your actions.
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On Fri, 27 Mar 2015 03:26 am, Tim Chase wrote:
[...]
Don't give the troll the attention he craves. He has as much told us that he
is beyond reason -- he's been trolling for years, you don't need to justify
your actions.
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lling for years, so don't bother to engage with him.
The problem with wrestling a pig in the mud is that you get dirty and the
pig enjoys it.
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YPT
files, but if it fails to find them when they are actually there, that's a
pretty big bug.
And one more quote:
"The First Rule of Program Optimization: Don't do it.
The Second Rule of Program Optimization (for experts only!):
Don't do it yet." — Michael A. Jackson
(No, not Michael Jackson the dead pop singer.)
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(1, 7), (1, 13), 'spam = "abcd" "efgh"\n')
(3, '"efgh"', (1, 14), (1, 20), 'spam = "abcd" "efgh"\n')
(4, '\n', (1, 20), (1, 21), 'spam = "abcd" "efgh"\n')
(0, '', (2, 0), (2, 0), '')
Looks to me that the two string literals each get their own token, and are
concatenated at a later stage of compilation, not during parsing.
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er than that, all those meanings are valid and have to be distinguished
from context.
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ow...
> On Tue, 24 Mar 2015 22:49:49 +1100, Steven D'Aprano
> wrote:
[...]
>>Even if there was support from the compiler to extract the docstring,
>>where would it be stored? Consider:
>>
>>spam = None
>>"""Spammy goodness."""
ing a Python regex, but given an incomplete one,
probably *not* prove that it is solvable. But I can't justify that in any
objective way.
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monks.org/?node_id=471168
I'm not a Perl expert, but I call that cheating, as it uses the ?{ ... }
construct to embed Perl code in the regex.
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g like that -- dont exactly remember the syntax)
Pascal is another language with a construct like that, and there's a FAQ for
it:
https://docs.python.org/2/faq/design.html#why-doesn-t-python-have-a-with-statement-for-attribute-assignments
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y, March 27, 2015 at 10:05:21 AM UTC+5:30, Steven D'Aprano wrote:
>> On Fri, 27 Mar 2015 01:21 pm, Rustom Mody wrote:
>>
>> > Anyway my point is that in python (after 2.2??) saying something is an
>> > object is a bit of a tautology -- ie verbiage without infor
:
- When I am forced to use a Windows application, middle-click *never*
pastes :-(
- Certain Linux applications like OpenOffice seem to have buggy
implementations of middle-click, and sometimes fail to recognise when
you've copied something in another application. But only sometimes.
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be awkward:
t = ([1, 2, 3], None, "spam")
t[0] += [4]
The problem isn't that the second line raises an exception, but that the
second line raises an exception and yet the addition succeeded.
So I am fairly dubious about extending a mixed blessing like augmented
assignment even further.
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say is absolutely correct. And yet middle-click paste is so
convenient when it works that I all but cry from frustration when I find an
application that doesn't support it.
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ass assignments? It seems hard to
> justify performance-wise since list is written in C, and if you need
> to beat it, then you probably shouldn't be doing so in Python.
https://www.safaribooksonline.com/library/view/python-cookbook/0596001673/ch14s05.html
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ython
programmer and member of the PSF, that's the Python Software Foundation,
not the PSU, the Python Secret Underground, which most definitely does not
exist.
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On Sat, 28 Mar 2015 08:53 pm, Steven D'Aprano wrote:
> It saves typing. It might even allow a micro-optimization in the generated
> bytecode (see below).
Oops, I forgot to include the "see below" bit.
Comparing
a = a.spam()
a .= spam()
the Python compiler could
On Sat, 28 Mar 2015 11:26 pm, Mark Lawrence wrote:
> On 28/03/2015 06:26, Steven D'Aprano wrote:
>>Pascal is another language with a construct like that, and there's a FAQ
>>for it:
>>
>>
https://docs.python.org/2/faq/design.html#why-doesn-t-python-have-a-wit
aster than optimized C,
my first reaction is to expect that you've probably made a mistake
somewhere. I would have the same reaction if somebody casually dropped into
a conversation that they happened to beat Usain Bolt's 100m personal best
of 9.58 seconds by almost four seconds. While car
On Sun, 29 Mar 2015 03:10 pm, Chris Angelico wrote:
> On Sun, Mar 29, 2015 at 2:06 PM, Steven D'Aprano
> wrote:
>> On Sun, 29 Mar 2015 10:50 am, BartC wrote:
>>
>>> (X is my own interpreted language, which is where my interest in this
>>> is. This had bee
On Sun, 29 Mar 2015 06:36 am, Mario Figueiredo wrote:
> On Sat, 28 Mar 2015 21:32:31 +1100, Steven D'Aprano
> wrote:
>
>>The famous Perl coder Allison Randal writes about why Perl is not dead
>>(it's just pining for the fjords *wink* ) and contrasts the Perl 5/
outdated. If only
things stayed like the Good Old Days when documentation was always 100%
accurate and up to date, before Python 3 ruined it for everybody!
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On Friday 03 April 2015 08:31, Thomas 'PointedEars' Lahn wrote:
> I am sorry that you cannot see that your argument is strewn with gaping
> defects in logic, but I think I will stop trying to convince you of that
> now.
I'm sorry, I've been away for four days and have lost track of this thread.
On Wednesday 01 April 2015 00:18, Albert van der Horst wrote:
> In article <[email protected]>,
> Steven D'Aprano wrote:
>>The biggest difference is syntactic. Here's an iterator which returns a
>>never-ending seque
indentation, the function is horribly
inefficient. Instead, use this:
import os
os.stat(filename).st_size
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al imports:
# mymodule2
mystring = u"äπЖ☃" # Also works in 3.3 or better.
# mymodule3
mystring = "äπЖ☃"
# main application
from __future__ import print_function
from future_builtins import *
if sys.version < '3':
import mymodule2 as mymodule
else:
imp
On Mon, 6 Apr 2015 09:23 pm, Dylan Evans wrote:
[content snipped]
Hi Dylan, and welcome!
If you're going to post in response to people's questions, would you please
disable HTML email and trim your responses? This mailing list is mirrored
on Usenet, as comp.lang.python, where HTML is against th
as built
without threading. That means you'll have to re-install to fix this
problem.
But first you'll need to install the necessary dependencies. What operating
system and/or distro are you using? It looks like Linux or Unix, or maybe
Mac OS X.
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rom importing the library, it imports your
version instead. Rename your gevent.py file and the problem will hopefully
go away.
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On Tue, 7 Apr 2015 12:05 am, Ian Kelly wrote:
> On Mon, Apr 6, 2015 at 5:52 AM, Steven D'Aprano
> wrote:
>> To the rest of the list... didn't somebody write up a wiki post on how to
>> convince Gmail to be less unreasonable about top posting, quoting, etc?
>&g
assume base 10.
That's just ridiculous.
In Python, like most other languages, the only thing which assumes base 10
is entry and printing of integers.
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tever their internal storage format uses,
which is normally base 2. They don't work in decimal, using the same
decimal routines you learned in school.
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answer until there is only one answer it hasn't
given, which is right (100 guesses). I assume that the Oracle is smart
enough to never repeat a guess.
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4 5 6 7 8 9.
Base 16 uses 0 1 2 3 4 5 6 7 8 9 A B C D E F.
Base one million uses what?
How would you write down 12345 in base one-million?
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t = Timer("s[0]; max(s)", setup)
py> min(t.repeat())
7.158415079116821
That's just over 7 seconds to calculate both the first and the highest digit
one million times, or about 7 microseconds each time.
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an Python's built-ins.
Besides, it isn't clear to me whether Jonas wants to convert decimal
293...490 *into* base 429496729 as you have done, or *base 429496729*
293...490 into decimal.
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On Wed, 8 Apr 2015 10:38 am, Steven D'Aprano wrote:
> On Wed, 8 Apr 2015 03:44 am, Ian Kelly wrote:
>
>>>>>
>
to_base(2932903594368438384328325832983294832483258958495845849584958458435439543858588435856958650865490,
>>>>> 429496729)
>> [27
catch everything.
I'm fairly dubious about catching everything, that sounds like a good way to
hide bugs, but if you need to catch everything, using Exception is the
usual way to do it.
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es.factors.factorise(2**111+1)
[3, 3, 1777, 3331, 17539, 25781083, 107775231312019L]
but that is the nature of factorising large numbers.
http://code.google.com/p/pyprimes/source/browse/
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On Fri, 10 Apr 2015 01:02 am, Chris Angelico wrote:
> On Fri, Apr 10, 2015 at 12:53 AM, Alain Ketterlin
> wrote:
>> Ouch, you're right, I tried to stick with Marko's example and forgot the
>> basics. I meant "signed ints", but the "removable" condition should be
>> something like:
>>
>> if (
argc, char *argv[])
{
int a;
a = 1;
int b;
b = 2147483647;
printf("a = %d\n", a);
printf("b = %d\n", b);
printf("a+b = %d\n", a+b);
return 0;
}
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On Thu, 9 Apr 2015 07:31 pm, Palpandi wrote:
> Hi all,
>
> Is there any way to roll back or undo changes which are all done before
> exception occurs.
Not automatically. You have to program it yourself.
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either the skill or inclination to write correct C
code. Even the Linux kernel contains bugs. Things were bad enough in the
old days of classical C compilers, but modern C optimizing compilers may
actively counteract your code as you have written it. How that isn't
considered an outright malicious act, I don't know.
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