False positive for math sqrt function

[ravisumit33]

Steps to reproduce

Given a file a.py:

"""
Module to test pylint
"""
from math import sqrt
print(sqrt(4))

Current behavior

Result of pylint a.py:

Expected behavior

pylint should not give error for math.sqrt function

pylint --version output

Result of pylint --version output:

On Stable release

pylint 2.8.3
astroid 2.5.6
Python 3.9.5 (default, May  4 2021, 03:33:11)
[Clang 12.0.0 (clang-1200.0.32.29)]

On preview release

pylint 3.0.0a3
astroid 2.6.0-dev0
Python 3.9.5 (default, May  4 2021, 03:33:11)
[Clang 12.0.0 (clang-1200.0.32.29)]

[Pierre-Sassoulas]

Hello, thank you for opening the issue, I can't reproduce this problem. What is your operating system and environment ?

[ravisumit33]

@Pierre-Sassoulas I am working on Mac OS Catalina in terminal. Installed pylint using pip3 install pylint and got this error.

[ravisumit33]

This duplicates #1524
I solved it using extension-pkg-allow-list=math in my pylintrc. However, I didn't get c-extension-no-member error rather no-name-in-module error which created the confusion.

[Pierre-Sassoulas]

Thank you for solving this. You must have a C binding for math on MacOs. I think I never saw the c-extension-no-member myself, half the issue about false positives for no-member and half the questions on stackoverflow could be avoided if c-extension-no-member was working properly because very often the answer is to put it in the extension-pkg-allow-list.