incorrect [attribute-error] for `multiprocessing.current_process()._identity[0]`

[nik-sm]

This snippet works, but pytype gives [attribute-error]:

File "scrap.py", line 6, in worker_fn: No attribute '_identity' on multiprocessing.process.BaseProcess [attribute-error]

import multiprocessing
from multiprocessing import Pool


def worker_fn(x):
    worker_idx = multiprocessing.current_process()._identity[0]
    print(f"worker idx: {worker_idx}")
    return x ** 2


with Pool(4) as pool:
    results = pool.map(worker_fn, range(8))

print(results)

$ pytype --version
2021.09.09

[rchen152]

We'll need to add the _identity attribute (with an # undocumented comment) to the BaseProcess here: https://github.com/python/typeshed/blob/master/stdlib/multiprocessing/process.pyi.

[rchen152]

This has been fixed upstream: python/typeshed#6041. The fix will be pulled in the next time we do a typeshed update.