How do I get PyLint to recognize numpy members?

Question

I am running PyLint on a Python project. PyLint makes many complaints about being unable to find numpy members. How can I avoid this while avoiding skipping membership checks.

From the code:

import numpy as np

print np.zeros([1, 4])

Which, when ran, I get the expected:

[[ 0. 0. 0. 0.]]

However, pylint gives me this error:

E: 3, 6: Module 'numpy' has no 'zeros' member (no-member)

For versions, I am using pylint 1.0.0 (astroid 1.0.1, common 0.60.0) and trying to work with numpy 1.8.0 .

Answer 1

This solution worked for me

Basically, go to Select the gear icon from bottom left=>Setting=>Workspace Setting =>Extension=>Python Configuration=>Click on any Settings.json => add this in the file "python.linting.pylintArgs" : [ "--extension-pkg-whitelist=numpy" ] I am using VS 1.27.2

Answer 2

I had this problem with numpy, scipy, sklearn, nipy, etc., and I solved it by wrapping epylint like so:

$ cat epylint.py

#!/usr/bin/python

"""
Synopsis: epylint wrapper that filters a bunch of false-positive warnings and errors
Author: DOHMATOB Elvis Dopgima <[e-mail]> <[e-mail]>

"""

import os
import sys
import re
from subprocess import Popen, STDOUT, PIPE

NUMPY_HAS_NO_MEMBER = re.compile("Module 'numpy(?:\..+)?' has no '.+' member")
SCIPY_HAS_NO_MEMBER = re.compile("Module 'scipy(?:\..+)?' has no '.+' member")
SCIPY_HAS_NO_MEMBER2 = re.compile("No name '.+' in module 'scipy(?:\..+)?'")
NIPY_HAS_NO_MEMBER = re.compile("Module 'nipy(?:\..+)?' has no '.+' member")
SK_ATTR_DEFINED_OUTSIDE_INIT = re.compile("Attribute '.+_' defined outside __init__")
REL_IMPORT_SHOULD_BE = re.compile("Relative import '.+', should be '.+")
REDEFINING_NAME_FROM_OUTER_SCOPE = re.compile("Redefining name '.+' from outer scope")

if __name__ == "__main__":
    basename = os.path.basename(sys.argv[1])
    for line in Popen(['epylint', sys.argv[1], '--disable=C,R,I'  # filter thesew arnings
                       ], stdout=PIPE, stderr=STDOUT, universal_newlines=True).stdout:
        if line.startswith("***********"):
            continue
        elif line.startswith("No config file found,"):
            continue
        elif "anomalous-backslash-in-string," in line:
            continue
        if NUMPY_HAS_NO_MEMBER.search(line):
            continue
        if SCIPY_HAS_NO_MEMBER.search(line):
            continue
        if SCIPY_HAS_NO_MEMBER2.search(line):
            continue
        if "Used * or ** magic" in line:
            continue
        if "No module named" in line and "_flymake" in line:
            continue
        if SK_ATTR_DEFINED_OUTSIDE_INIT.search(line):
            continue
        if "Access to a protected member" in line:
            continue
        if REL_IMPORT_SHOULD_BE.search(line):
            continue
        if REDEFINING_NAME_FROM_OUTER_SCOPE.search(line):
            continue
        if NIPY_HAS_NO_MEMBER.search(line):
            continue
        # XXX extend by adding more handles for false-positives here
        else:
            print line,

This script simply runs epylint, then scrapes its output to filter out false-positive warnings and errors. You can extend it by added more elif cases.

N.B.: If this applies to you, then you'll want to modify your pychechers.sh so it likes like this

#!/bin/bash

epylint.py "$1" 2>/dev/null
pyflakes "$1"
pep8 --ignore=E221,E701,E202 --repeat "$1"
true

(Of course, you have to make epylint.py executable first)

Here is a link to my .emacs https://github.com/dohmatob/mydotemacs. Hope this is useful to someone.

Answer 3

If using Visual Studio Code with Don Jayamanne's excellent Python extension, add a user setting to whitelist numpy:

{
    // whitelist numpy to remove lint errors
    "python.linting.pylintArgs": [
        "--extension-pkg-whitelist=numpy"
    ]
}

Answer 4

I had the same issue here, even with the latest versions of all related packages (astroid 1.3.2, logilab_common 0.63.2, pylon 1.4.0).

The following solution worked like a charm: I added numpy to the list of ignored modules by modifying my pylintrc file, in the [TYPECHECK] section:

[TYPECHECK]

ignored-modules = numpy

Depending on the error, you might also need to add the following line (still in the [TYPECHECK] section):

ignored-classes = numpy

Answer 5

I've been working on a patch to pylint to solve the issue with dynamic members in libraries such as numpy. It adds a "dynamic-modules" option which forces to check if members exist during runtime by making a real import of the module. See Issue #413 in logilab/pylint. There is also a pull request, see link in one of the comments.

Answer 6

This seems to work on at least Pylint 1.1.0:

[TYPECHECK]

ignored-classes=numpy