False positive error report E1101 with EnvironmentError

[plocharz-9livesdata]

test-pylint.py

import os
import psutil

try:
    os.stat("does not exist")
except psutil.Error as e:
    pass

try:
    os.stat("does not exist")
except EnvironmentError as e:
    err = e.strerror

Steps to reproduce

1. run pylint -E test-pylint.py

Current behavior

************* Module test-pylint
test-pylint.py:12:10: E1101: Instance of 'Error' has no 'strerror' member (no-member)

Expected behavior

No output is expected

Workaround:

Use different names for error variables:

import os
import psutil

try:
    os.stat("does not exist")
except psutil.Error as e:
    pass

try:
    os.stat("does not exist")
except EnvironmentError as exc:
    err = exc.strerror

pylint --version output

pylint 2.3.0
astroid 2.2.0
Python 3.6.7 (v3.6.7:6ec5cf2, Oct 22 2018, 11:29:07) 
[GCC 4.8.4]

[PCManticore]

Yikes, thanks for reporting the issue! What's happening is that the inference engine is dumb and can't limit the inference of e from the second except handler, resulting in inferring both e as both Error and EnvironmentError. We should definitely address this in astroid.

[PCManticore]

This is fixed in astroid's master which is going to be astroid 2.3.0 when launched.