On 21/04/2017 16:03, Guyzmo via Python-Dev wrote:
On Fri, Apr 21, 2017 at 11:47:24AM +0200, Justus Schwabedal wrote:
At least I think it's a bug. Maybe it's a feature..
it's indeed a feature.
I possibly found a bug in class __init__ and would like to fix it
technically, it's a method. Mor
And it is not related to __init__ method.
You have the same behaviour with any other function or method.
>>> def append_to_list(item, l=[]):
... l.append(item)
... return l
...
>>> append_to_list(1)
[1]
>>> append_to_list(2)
[1, 2]
2017-04-21 17:18 GMT+02:00 Manolis Mavrofidis :
> In a n
ACTIVITY SUMMARY (2017-04-14 - 2017-04-21)
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Issues counts and deltas:
open5882 ( -7)
closed 36004 (+64)
total 41886 (+57)
Open issues wit
In a nutshell.
You create two instances and you assign the same list to both of them
which you instantiate when you run your code.
>>> id(spam_1.list)
4530230984 # <- Here
>>> id(spam_2.list)
4530230984 # <- Here
>>> id(spam_1)
4530231632 # Nice unique instance
>>> id(spam_2)
4530231200 # Nice uniq
On 21 April 2017 at 12:09, Justus Schwabedal wrote:
> I possibly found a bug in class initialization and would like to fix it.
>
> Here comes the bug-producing example:
>
> `class Foo:
> def __init__(self, bar=[]):
> self.list = bar
>
> spam_1 = Foo()
> spam_2 = Foo()
>
> spam_1.list.a
On Fri, Apr 21, 2017 at 11:47:24AM +0200, Justus Schwabedal wrote:
> At least I think it's a bug. Maybe it's a feature..
it's indeed a feature.
> I possibly found a bug in class __init__ and would like to fix it
technically, it's a method. More precisely, it's the constructor method.
> So I'm
This is correct behaviour. I would suggest that you post this to
python-list for a full discussion of what's going on here, but
basically the default value for argument bar of __init__ is created at
class creation time, and then reused for every instance. This is a
common mistake made by newcomers,
Hi everyone,
I possibly found a bug in class initialization and would like to fix it.
Because it's my first journey to core-dev, I would really appreciate the
help of a mentor that I may ask a few questions to get me up to speed.
To my person, I have previously worked on larger projects in python
Hi everyone,
I possibly found a bug in class __init__ and would like to fix it. So I'm
looking for a mentor to help me.
`class Foo:
def __init__(self, bar=[]):
self.list = bar
spam_1 = Foo()
spam_2 = Foo()
spam_1.list.append(42)
print(spam_2.list)`
At least I think it's a bug. Ma
