Questions tagged [pylint]
Pylint is a Python source code analyzer looking for bugs and signs of poor quality.
pylint
1,745
questions
433
votes
14
answers
578k
views
How do I disable a Pylint warning?
I'm trying to disable warning C0321 ("more than one statement on a single line" -- I often put if statements with short single-line results on the same line), in Pylint 0.21.1 (if it matters:...
- 39.1k
409
votes
2
answers
147k
views
Pylint, PyChecker or PyFlakes? [closed]
I would like to get some feedback on these tools on:
features;
adaptability;
ease of use and learning curve.
- 587k
342
votes
9
answers
192k
views
PyLint message: logging-format-interpolation
For the following code:
logger.debug('message: {}'.format('test'))
pylint produces the following warning:
logging-format-interpolation (W1202):
Use % formatting in logging functions and pass ...
- 14.7k
330
votes
35
answers
469k
views
PyLint "Unable to import" error - how to set PYTHONPATH?
I'm running PyLint from inside Wing IDE on Windows. I have a sub-directory (package) in my project and inside the package I import a module from the top level, ie.
__init__.py
myapp.py
one.py
subdir\
...
- 60.5k
319
votes
5
answers
296k
views
Is it possible to ignore one single specific line with Pylint?
I have the following line in my header:
import config.logging_settings
This actually changes my Python logging settings, but Pylint thinks it is an unused import. I do not want to remove unused-...
- 30.8k
256
votes
2
answers
134k
views
Why is the empty dictionary a dangerous default value in Python? [duplicate]
I put a dict as the default value for an optional argument to a Python function, and pylint (using Sublime package) told me it was dangerous. Can someone explain why this is the case? And is a better ...
- 11.7k
247
votes
40
answers
444k
views
Pylint "unresolved import" error in Visual Studio Code
I am using the following setup
macOS v10.14 (Mojave)
Python 3.7.1
Visual Studio Code 1.30
Pylint 2.2.2
Django 2.1.4
I want to use linting to make my life a bit easier in Visual Studio Code. However, ...
- 3,255
238
votes
4
answers
100k
views
Why is the use of len(SEQUENCE) in condition values considered incorrect by Pylint?
Considering this code snippet:
from os import walk
files = []
for (dirpath, _, filenames) in walk(mydir):
# More code that modifies files
if len(files) == 0: # <-- C1801
return None
I was ...
- 28.9k
229
votes
7
answers
159k
views
Instance attribute attribute_name defined outside __init__
I split up my class constructor by letting it call multiple functions, like this:
class Wizard:
def __init__(self, argv):
self.parse_arguments(argv)
self.wave_wand() # declaration ...
- 3,697
205
votes
3
answers
181k
views
How do I create a pylintrc file
I am running linux. Can I do something like pylint --generate-rcfile > .pylintrc and then make changes to the resulting .pylintrc file to override the default settings? And if so should it be in my ...
- 2,269
200
votes
18
answers
352k
views
How do I disable "missing docstring" warnings at a file-level in Pylint?
Pylint throws errors that some of the files are missing docstrings. I try and add docstrings to each class, method and function, but it seems that Pylint also checks that files should have a docstring ...
193
votes
23
answers
108k
views
How do I get Pylint to recognize NumPy members?
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 ...
- 2,864
169
votes
4
answers
121k
views
What does Pylint's "Too few public methods" message mean?
I'm running Pylint on some code, and receiving the error "Too few public methods (0/2)". What does this message mean?
The Pylint documentation is not helpful:
Used when a class has too few ...
- 46.6k
151
votes
13
answers
64k
views
Using Pylint with Django
I would very much like to integrate pylint into the build process for
my python projects, but I have run into one show-stopper: One of the
error types that I find extremely useful--:E1101: *%s %r has ...
- 16.6k
149
votes
7
answers
74k
views
Why does Pylint object to single-character variable names?
I'm still getting used to Python conventions and using Pylint to make my code more Pythonic, but I'm puzzled by the fact that Pylint doesn't like single character variable names. I have a few loops ...
- 12.4k
145
votes
6
answers
137k
views
Disable all Pylint warnings for a file
We are using Pylint within our build system.
We have a Python package within our code base that has throwaway code, and I'd like to disable all warnings for a module temporarily so I can stop bugging ...
- 9,922
131
votes
8
answers
217k
views
ImportError : Attempted relative import with no known parent package [duplicate]
I am learning to program with python and I am having issues with importing from a module in a package. I am usingvisual studio code with Python 3.8.2 64 bit.
My Project Directory
.vscode
├── ecommerce
...
- 1,517
125
votes
17
answers
151k
views
Run Pylint for all Python files in a directory and all subdirectories
I have
find . -iname "*.py" -exec pylint -E {} ;\
and
FILES=$(find . -iname "*.py")
pylint -E $FILES
If I understand correctly, the first command will run pylint for each of the Python files, the ...
- 3,027
109
votes
8
answers
130k
views
How to run Pylint with PyCharm
I want to configure Pylint as an external tool in my entire project directory for a Python project that I'm working on. I've tried to use the repository as a module with __init__.py and without, and ...
- 1,319
108
votes
1
answer
65k
views
How to fix pylint logging-not-lazy? [duplicate]
I am using prospector to examine my code. Pylint returned a logging-not-lazy warning about my debug message.
Line: 31
pylint: logging-not-lazy / Specify string format arguments as logging function ...
- 5,530
102
votes
8
answers
134k
views
Avoid Pylint warning E1101: 'Instance of .. has no .. member' for class with dynamic attributes
Imagine a function which dynamically adds attributes to an object using setattr. The reason for doing so is that I want to map some external structure (e.g. a given parameter tree) to an object:
...
- 9,342
102
votes
1
answer
67k
views
Pylint raise-missing-from
I have a pylint message (w0707) on this piece of code (from https://www.django-rest-framework.org/tutorial/3-class-based-views/):
class SnippetDetail(APIView):
"""
Retrieve, ...
- 1,122
99
votes
4
answers
34k
views
pytest fixtures Redefining name from outer scope [pylint]
I'm learning pytest and I lint my code with pylint.
But pylint still complaints about:
W0621: Redefining name %r from outer scope (line %s)
for the following example from pytest:
# test_wallet.py
@...
- 1,265
96
votes
15
answers
197k
views
Error message "Linter pylint is not installed"
I want to run Python code in Microsoft Visual Studio Code but it gives an error:
Linter pylint is not installed
I installed:
The Visual Studio Code Python extension
Python 3
Anaconda
How can I ...
- 1,765
89
votes
6
answers
49k
views
How do I tell PyLint "it's a variable, not a constant" to stop message C0103?
I have a module-level variable in my Python 2.6 program named "_log", which PyLint complains about:
C0103: Invalid name "_log" (should match (([A-Z_][A-Z0-9_]*)|(__.*__))$)
Having read this answer I ...
- 60.5k
85
votes
9
answers
71k
views
PyLint not recognizing cv2 members
I am running pylint on an opencv project and I am getting many pylint errors in VS code about members not being present.
Example code:
import cv2
cv2.imshow(....)
Errors obtained:
However , the ...
- 2,068
84
votes
4
answers
77k
views
How to deal with Pylint's "too-many-instance-attributes" message?
I have just tried to lint some code with Pylint, and the last remaining error is
R0902: too-many-instance-attributes (8/7)
I understand the rationale behind limiting the number of instance ...
- 6,262
81
votes
11
answers
170k
views
Python: avoiding Pylint warnings about too many arguments
I want to refactor a big Python function into smaller ones. For example, consider this following code snippet:
x = x1 + x2 + x3 + x4 + x5 + x6 + x7 + x8 + x9
Of course, this is a trivial example. In ...
- 3,021
80
votes
3
answers
98k
views
Pylint invalid constant name
I'm receiving a Pylint error regarding my constant: MIN_SOIL_PARTICLE_DENS (invalid name).
Any ideas why this constant is wrong? Here's my full function:
def bulk_density(clay, sand, organic_matter):
...
- 3,833
78
votes
7
answers
27k
views
Finding dead code in large python project [closed]
I've seen How can you find unused functions in Python code? but that's really old, and doesn't really answer my question.
I have a large python project with multiple libraries that are shared by ...
- 12k
77
votes
4
answers
29k
views
Why doesn't Pylint like built-in functions?
I have a line like this:
filter(lambda x: x == 1, [1, 1, 2])
Pylint is showing a warning:
W: 3: Used builtin function 'filter'
Why is that? is a list comprehension the recommended method?
Of ...
- 18.1k
74
votes
4
answers
30k
views
Best practice for setting the default value of a parameter that's supposed to be a list in Python?
I have a Python function that takes a list as a parameter. If I set the parameter's default value to an empty list like this:
def func(items=[]):
print items
Pylint would tell me "Dangerous ...
- 2,622
74
votes
1
answer
52k
views
How to handle the pylint message: Warning: Method could be a function
I have a python class and ran pylint against it. One message it gave was:
Warning: Method could be a function
Is this telling me that it would be better to move this method out of the class because ...
- 3,448
70
votes
6
answers
63k
views
Should wildcard import be avoided?
I'm using PyQt and am running into this issue. If my import statements are:
from PyQt4.QtCore import *
from PyQt4.QtGui import *
then pylint gives hundreds of "Unused import" warnings. I'm ...
- 10.6k
68
votes
9
answers
83k
views
Ignore by directory using Pylint
The following is from the Pylint documentation:
--ignore=<file>
Add <file or directory> to the black list. It should be a
base name, not a path. You may set this option multiple
...
- 6,194
64
votes
14
answers
48k
views
Pylint can't find SQLAlchemy query member
I have a Flask (v0.10.1) application using Flask-SQLAlchemy (v2.0) and I'm trying to configure Pylint to check it. Running with Python 3.4.2.
First error was:
Instance of 'SQLAlchemy' has no 'Table'...
- 649
64
votes
4
answers
96k
views
Pylint: overriding max-line-length in individual file
Is it possible to change max-line-length settings for one file out of a project (while performing all other checks defined in rc file on it)?
Ideally, it should behave like inline pylint: disable=x ...
- 22.6k
60
votes
3
answers
106k
views
Pylint showing invalid variable name in output
I made a simple python script to post data on a website.
#Imports
url_to_short = sys.argv[1]
post_url = 'https://www.googleapis.com/urlshortener/v1/url'
headers = {'Content-Type': 'application/json'...
- 49k
58
votes
4
answers
19k
views
pylint 1.4 reports E1101(no-member) on all C extensions
We've been long-time fans of pylint. Its static analysis has become a critical part of all our python projects and has saved tons of time chasing obscure bugs. But after upgrading from 1.3 -> 1.4, ...
- 11.6k
58
votes
4
answers
110k
views
"No name in module" error from Pylint
I have a file named main.py with the following code:
#!/usr/bin/env python3
import utils.stuff
if __name__ == "__main__":
print("hi from main.py")
utils.stuff.foo()
In the directory with ...
- 98.6k
54
votes
2
answers
30k
views
Python - Should I put my helper functions inside or outside the class? [closed]
In Python, if some methods of a class need a helper function, but the helper function itself doesn't use anything in the class, should I put the helper function inside or outside the class?
I tried ...
- 2,622
54
votes
3
answers
60k
views
How do I automatically fix lint issues reported by pylint?
Just like we have "eslint --fix" to automatically fix lint problems in Javascript code, do we have something for pylint too for Python code?
- 4,897
53
votes
2
answers
42k
views
Pylint to show only warnings and errors
I would like to use pylint to check my code but I am only interested in error and warning levels. Is there a way to do that in command line or in pylintrc?
I am not interested in filtering given ...
- 1,606
50
votes
1
answer
41k
views
pylint duplicate code false positive
I have this code in (many) of my Python files for a project.
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import ...
49
votes
13
answers
64k
views
Why does it say that module pygame has no init member?
This is the code I have:
import pygame
pygame.init()
I'm very confused because if I try to run the file, then there seems to be no issue, but pylint says the following:
E1101:Module 'pygame' has ...
- 491
47
votes
5
answers
60k
views
Error message "python-pylint 'C0103:Invalid constant name"
I'm confused about the error(s) in this photo:
I don't know how to fix them. My program is a Python-Flask web frame. When I use Visual Studio Code to debug my program, Pylint shows these errors. I ...
- 167
46
votes
6
answers
73k
views
Silence PyLint warning about unused variables for string interpolation
The say module brings string interpolation to Python, like this:
import say
def f(a):
return say.fmt("The value of 'a' is {a}")
However, PyLint complains that the variable 'a' is never used. ...
- 2,924
45
votes
10
answers
18k
views
Invoking Pylint programmatically
I'd like to invoke the Pylint checker, limited to the error signalling part, as part of my unit testing. So I checked the Pylint executable script, got to the pylint.lint.Run helper class and there I ...
- 9,548
45
votes
2
answers
10k
views
Pylint: Disable specific warnings for specific folder
We have a Python project laid out like this:
project/
├── .pylintrc
├── module1.py
├── module2.py
└── tests/
├── test_module1.py
└── test_module2.py
Our unit and function tests reside in the ...
- 8,152
44
votes
4
answers
10k
views
List of pylint human readable message ids?
Recent versions of pylint allow for suppressing messages with human readable message ids. For example, instead of
class MyTest(unittest.TestCase): # pylint: disable=R0904
...
you can specify:
...
- 1,611