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classification
Title: CFunctionType object should be hashable in Python
Type: enhancement Stage:
Components: Interpreter Core Versions: Python 3.9
process
Status: open Resolution:
Dependencies: Superseder:
Assigned To: Nosy List: xxm
Priority: normal Keywords:

Created on 2021-03-16 03:10 by xxm, last changed 2022-04-11 14:59 by admin.

Messages (1)
msg388804 - (view) Author: Xinmeng Xia (xxm) Date: 2021-03-16 03:10 
See the following examples, ctypes.resize is a built-in function and it's hashable.   ctypes.memset is a C function (CFunctionType object) and it's “unhashable”.  However,  ctypes.resize and  ctypes.memset are both immutable. They should act the same in Python. It should not report unhashable type error when ctypes.memset  calls  __hash__(). 

-----------------------------------------------
>>> import ctypes
>>> ctypes.resize
<built-in function resize>
>>> ctypes.resize.__hash__()
146309

>>> ctypes.memset
<CFunctionType object at 0x7fab55961400>
>>> ctypes.memset.__hash__()
Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
TypeError: unhashable type
-----------------------------------------------

Python version: 3.9.2
system: Ubuntu
Expected output: 
ctypes.memset is hashable.
History
Date User Action Args
2022-04-11 14:59:42adminsetgithub: 87675
2021-03-22 07:11:17xxmsettype: compile error -> enhancement
2021-03-16 03:10:32xxmcreate