Hi,
In the pep,
https://www.python.org/dev/peps/pep-0492/#examples-of-await-expressions
It is said,
await await coro() is SyntaxError, instead, we should use await (await coro())
Why? because of await is not left-associative?
also, for
await -coro() , it should be written as, await (-coro
Hi,
Given a = [1, 2]
a.extend(a) makes a = [1,2, 1,2]
One might guess a.extend(a) would turn into an infinite loop. It turns out
here Python first gets all the items of `a' and then append them to `a', so the
infinite loop is avoided.
My question is, is there any doc on the behavior of thing
Hi,
I am using Python2.
For the following snippet,
http://ideone.com/i36pKO
I'd suppose the dummy_func would be invoked, but seems not.
Indeed, heapq.heapify does invoke cmp_lt per here:
https://hg.python.org/cpython/file/2.7/Lib/heapq.py#l136
So why this way of monkey patching failed?
Reg
Hi,
I wanna simulate C style integer division in Python3.
So far what I've got is:
# a, b = 3, 4
import math
result = float(a) / b
if result > 0:
result = math.floor(result)
else:
result = math.ceil(result)
I found it's too laborious. Any quick way?
--
吾輩は猫である。ホームーページはhttps://introo.me
Yep. I followed from bltmodule.c(the import function) and got to the
import.c file, and finally got lost.
Regards.
On Tue, Jul 21, 2015 at 12:16 PM, Mark Lawrence
wrote:
> On 21/07/2015 16:35, Shiyao Ma wrote:
>
>> Hi,
>>
>> It looks to me that the import system of Py
Hi,
It looks to me that the import system of Python will ignore invalid
directories and cache the result in memory.
For example, the following code:
paste here: https://bpaste.net/show/b144deb42620
#!/usr/bin/env python3
import sysimport osimport shutil
sys.path.append("./test")shutil.rmtree("./
On Wed, Apr 8, 2015 at 11:24 AM, Ian Kelly wrote:
> The ref count is incremented because the caller will decrement it when
> it's done with the reference.
That makes sense.
To be generic, the caller won't check what the returned result is. It
just takes it as a normal PyObject. Traditionally, fo
Hi.
While reading the rich_compare of PyLongObject, I noticed this line:
https://hg.python.org/cpython/file/a49737bd6086/Objects/longobject.c#l2785
It increments the ob_ref of the builtin True/False object.
Initializing the ob_ref of True/False to one so that they won't be
garbage collected if
instantiate an instance of Node
n = Node()
# I checked, there is no __dict__ on 'n'
# but the following succeeds.
n.foobar = 3
My understanding is the foobar is stored in n.__dict__, but seemingly n has no
__dict__.
So where does the foobar go?
TIA.
--
Shiyao Ma
http://introo.me
On Jan 05 at 22:38 +0800, Shiyao Ma wrote:
> More preferably, you should repetitively use "str.find"
>
> Or just use `max(0,len(zmienna.split(szukana))-1)`
Forgot there was a `str.count`, ;).
--
Shiyao Ma
http://introo.me
--
https://mail.python.org/mailman/listinfo/python-list
else:
continue
return count
More preferably, you should repetitively use "str.find"
Or just use `max(0,len(zmienna.split(szukana))-1)`
--
Shiyao Ma
http://introo.me
--
https://mail.python.org/mailman/listinfo/python-list
Thanks guys.
I was only aware of a limited iterables which themselves are iterators, e.g.,
the generator.
Seems like its really a pitfall. Any glossary, list on the iterables that
*might* exhaust themselves?
Regards.
--
https://mail.python.org/mailman/listinfo/python-list
One thing to note, the logic of using "in" is not of concern here.
This is a *contrived* example, the problem is the slowness of the first
iteration.
--
https://mail.python.org/mailman/listinfo/python-list
oop with ', 9.5367431640625e-07)
('B, finish a loop with ', 9.5367431640625e-07)
...
"""
We can see that the first iteration of B ends rather slow, 8.7 seconds here.
Why? I am curious about the internals, what's happening under the hood that
makes this happen?
Thanks in advance!
--
Shiyao Ma
http://introo.me
--
https://mail.python.org/mailman/listinfo/python-list
.. else:
> ... print "BYE"
> ...
so see here: https://bpaste.net/show/d2f1cf66a492 . It prints "HI"
/me always wishes code is sent without others doing some extra formatting
before testing.
Hope that helps.
--
Shiyao Ma
http://introo.me
--
https://mail.python.org/mailman/listinfo/python-list
n, based on what information a thread is formed?
--
Shiyao Ma
http://introo.me
--
https://mail.python.org/mailman/listinfo/python-list
within function:
>
> >>> def myfunc():
> x = ([1, 2], [3, 4], [5, 6])
> L = []
> [L.extend(i) for i in x]
> print(L)
>
> >>>myfunc()
> [1, 2, 3, 4, 5, 6]
This is also so true, as you are print the var 'L'.
>
> The q
2014-11-29 11:36 GMT+08:00 Chris Angelico :
> You can use id() on any object. You are guaranteed to get back an
> integer which is both stable and unique among all ids of objects that
> exist at the same time as the one you called it on. For as long as the
> object continues to exist, that number *
2014-11-28 13:00 GMT+08:00 Chris Angelico :
> On Fri, Nov 28, 2014 at 2:04 PM, Shiyao Ma wrote:
>> What if it's in the local namespace of a function or method? IDK, try
>> to get that thing first.
>
Sure enough. I will even avoid using "id" as it's dependent
2014-11-28 9:26 GMT+08:00 Seymore4Head :
> def __str__(self):
> s = "Hand contains "
> for x in self.hand:
> s = s + str(x) + " "
> return s
>
> This is part of a Hand class. I need a hand for the dealer and a hand
> for the player.
> dealer=Hand()
> player=
When reading the notes on co_lnotab
I totally got lost at this
line:https://hg.python.org/cpython/file/fd0c02c3df31/Objects/lnotab_notes.txt#l31
It says,"In case #b, there's no way to know
from looking at the table later how many were written."
No way to know "what" is written?
And why no way
Hi.
what's the location of the function that reads the .pyc file ?
I bet it should lie in somewhere in
https://hg.python.org/cpython/file/322ee2f2e922/Lib/importlib
But what's the actual location?
Btw, why I need it?
I want to know the structure of a .pyc file. Of course the function
that read
No intent to pollute this thread.
But really interested in the invalid@invalid.invalid mailing address.
And,,, obviously, I cannot send to invalid@invalid.invalid, so
How does you(he) make this?
2014-07-21 22:27 GMT+08:00 Grant Edwards :
> I was always taught that it's a "bug" is when a program
Hi.
Anyone with working experience on setting up Python3 dev with vim?
functionalities needed: code completion and jump to defintion
YCM suffices but only with py2.
Any vim (plugin) for py3?
Or do you have any experience both running YCM and jedi-vim(for py3) ?
How's that going?
Regards
--
Hi Pythonistas
I often heard people mention use help(ob) as a way of documentation
look up. Personally I seldom/never do that. My normal workflow is use
ipython, obj? or obj?? for quick look up or use docs.python.org for a
detailed read.
Do you use `help`? How does it integrate into your workflo
Ask on the goagent googlecode?
exe is fow win, dig out more on the linux version. I bet it should be
delivered with py source in that version.
Regards.
2014-07-03 10:20 GMT+08:00 liuerfire Wang :
> Hi 水静流深
> the source code is on https://github.com/goagent/goagent
>
> Hi Terry,
> GoAgent, a to
I wonder if it's opensourced. I am kinda interested in its implementation.
On the whole, the performance is rather good.
2014-06-10 22:39 GMT+08:00 Mark H Harris :
> On 6/9/14 3:54 PM, Carlos Anselmo Dias wrote:
>
>> Hi ...
>>
>> I'm finishing my messages with this ...
>>
>> The first time I loo
It would be great if someone could discuss it from the viewpoint of
bytecode. e.g., how the stack is popped, etc.
2014-06-09 17:40 GMT+08:00 Marko Rauhamaa :
> Philip Shaw :
>
> > OTOH, it could just be that Guido didn't think of banning [return from
> > finally] when exceptions were first added
2014-06-09 23:34 GMT+08:00 Roy Smith :
> We noticed recently that:
>
> >>> None in 'foo'
>
> raises (at least in Python 2.7)
>
> TypeError: 'in ' requires string as left operand, not NoneType
>
> This is surprising. The description of the 'in' operatator is, 'True if
> an item of s is equal to x,
Sorry. I don't quite get it. As you said, it first tries,
leftOperand.__eq__(rightOperand) then if it returns NotImplemented, it goes
to invoke rightOperand.__eq__(leftOperand). But for any reason, [] == ()
returns false, why?
On Mon, Aug 5, 2013 at 7:06 AM, Chris Angelico wrote:
> On Sun, Aug
After read Dave's answer, I think I confused LEGB with attribute lookup.
So, a.r has nothing to do with LEGB.
On Tue, Mar 26, 2013 at 7:03 PM, Shiyao Ma wrote:
> Thx, really a nice and detailed explanation.
>
>
> On Tue, Mar 26, 2013 at 6:07 PM, Dave Angel wrote:
>
>&
Thx, really a nice and detailed explanation.
On Tue, Mar 26, 2013 at 6:07 PM, Dave Angel wrote:
> On 03/26/2013 02:17 AM, Shiyao Ma wrote:
>
>> Hi,
>> suppose I have a file like this:
>> class A:
>> r = 5
>> def func(self, s):
>> sel
urn a formatted version of S, using substitutions from args and
kwargs.
The substitutions are identified by braces ('{' and '}').
"""
pass
I am curious how you find the corresponding c source code.
On Tue, Mar 26, 2013 at 2:16 PM, Ian Kell
ote:
> On Tue, Mar 26, 2013 at 5:17 PM, Shiyao Ma wrote:
> > class A:
> > r = 5
> > def func(self, s):
> > self.s = s
> > a = A()
> > print(a.r)# this should print 5, but where does py store the name of
> r
>
> What do you mean by
PS, I now python's scoping rule is lexical rule (aka static rule). How does
LEGB apply to class?
On Tue, Mar 26, 2013 at 2:17 PM, Shiyao Ma wrote:
> Hi,
> suppose I have a file like this:
> class A:
> r = 5
> def func(self, s):
> self.s = s
> a =
Hi,
suppose I have a file like this:
class A:
r = 5
def func(self, s):
self.s = s
a = A()
print(a.r)# this should print 5, but where does py store the name of r
a.func(3)
print(a.s)# this should print 3, also where does py store this name.
what's the underlying difference b
HI.
one thing confuses me.
It is said in the pep3101 that "{}".format (x) will invoke the method
x.__format__
However, I looked at the src of python3 and found:
in class str(object), the format simply contains a pass statement
in class int(object), things is the same.
So, what's the mechanism that
Yes, sounds good. I should give it a try.
On Tue, Mar 12, 2013 at 1:02 AM, Xavier L. wrote:
> On 13-03-11 10:42 AM, Shiyao Ma wrote:
>
>> Today I come across a problem.
>> Basically, my need is that I want to launch a http server that can not
>> only support get but also
Today I come across a problem.
Basically, my need is that I want to launch a http server that can not only
support get but also support post (including post file).
My first idea is to use -m http.sever. However, it only supports get.
Later I find some one extended basehttpserver and made it suppor
39 matches
Mail list logo
