New submission from Bob Fang <[email protected]>:
I have this minimal example:
```
from functools import wraps
from concurrent import futures
import random
def decorator(func):
num_process = 4
def impl(*args, **kwargs):
with futures.ProcessPoolExecutor() as executor:
fs = []
for i in range(num_process):
fut = executor.submit(func, *args, **kwargs)
fs.append(fut)
result = []
for f in futures.as_completed(fs):
result.append(f.result())
return result
return impl
@decorator
def get_random_int():
return random.randint(0, 100)
if __name__ == "__main__":
result = get_random_int()
print(result)
```
If we try to run this function I think we will have the following error:
```
_pickle.PicklingError: Can't pickle <function get_random_int at
0x7f06cee666a8>: it's not the same object as __main__.get_random_int
```
I think the main issue here is that the "wraps" decorator itself alters the
`func` object and thus make it impossible to pickle. I found this rather
strange. I am just wondering if there is any way to get around this behavior? I
would want to use `wraps` if possible. Thanks!
----------
components: Library (Lib)
messages: 375614
nosy: bob.fang.london
priority: normal
severity: normal
status: open
title: Cannot use ProcessPoolExecutor if in a decorator?
type: behavior
versions: Python 3.8
_______________________________________
Python tracker <[email protected]>
<https://bugs.python.org/issue41577>
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