pylint

#python   #project   #template   #pylint   #linter   #git-hook  

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Table of Content

pylint

Linting is the automated source code checking for programmatic and stylistic errors.
A lint tool is a basic static code analyzer

pylint is default VSCode linter and it enable by default

install

install

pip install pylint

VSCode

Settings

vscode settings

"python.linting.pylintEnabled": true

Extensions

pylint extension for Visual Studio Code

• Execute pylint automatically on python file
• bundle with pylint can changed by settings pylint.path

Control

control pylint with rules file .pylintrc

pylintrc file location

• /etc/pylintrc
• ~/pylintrc
• <project_path>/pylintrc

create pylintrc

pylint --generate-rcfile > pylintrc

VSCode

VSCode look automaticly for pylintrc at the project root

pylintrc

pre-commit git hook not found the pylintrc file if we prefix it with dot (.pylintrc)

VSCode file mapping

map pylintrc file to ini type

"files.associations": {
    "pylintrc": "ini"
},

Demo

minimal pylintrc file to disabled checker message

[MASTER]
disable=
    C0114, # (missing-module-docstring)
    C0115,  # (missing-class-docstring)

Demo II

Add rules inline

• Add comment to end of line

# pylint: disable=[problem-code]

# pylint: disable=unused-private-member

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Run manual

~/.local/bin/pylint <file full path>
~/.local/bin/pylint --rcfile=<config_file> <file full path>

demo

~/.local/bin/pylint --rcfile pylintrc  pylint_demo.py
************* Module pylint_demo
pylint_demo.py:2:4: R0201: Method could be a function (no-self-use)
pylint_demo.py:1:0: R0903: Too few public methods (1/2) (too-few-public-methods)

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git hook

• Install pre-commit python util
• Add .pre-commit-config.yaml
• Run pre-commit install
• Add files to stage
• Run pre-commit run or try commit stage files

install

pip install pre-commit

.pre-commit-config.yaml

repos:
  - repo: local
    hooks:
      - id: pylint
        name: pylint
        entry: pylint
        language: system
        types: [python]
        args: 
            [
            "--rcfile=pylintrc"
            ]

Demo

 ~/.local/bin/pre-commit run
[WARNING] Unstaged files detected.
[INFO] Stashing unstaged files to /home/user/.cache/pre-commit/patch1681097484-36170.
pylint...................................................................Failed
- hook id: pylint
- exit code: 8

************* Module pylint_demo
linters/pylint_demo.py:1:0: R0903: Too few public methods (1/2) (too-few-public-methods)

-------------------------------------------------------------------
Your code has been rated at 6.67/10 (previous run: 10.00/10, -3.33)



[INFO] Restored changes from /home/user/.cache/pre-commit/patch1681097484-36170.

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pylintrc template

[MASTER]
disable=
    C0114, # (missing-module-docstring)
    C0115, # (missing-class-docstring)
    C0116, # (missing-function-docstring)

[FORMAT]
# Maximum number of characters on a single line.
max-line-length=120

[BASIC]
# Good variable names which should always be accepted, separated by a comma
good-names=x,y

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Tips

line disable

import config.logging_settings # pylint: disable=unused-import

function scope disable

def test():
    # Disable all the no-member violations in this function
    # pylint: disable=no-member
    ...
    # pylint: enable=no-member

Tips

E1101:Module 'pygame' has no 'init' member

"python.linting.pylintArgs": [
    "--extension-pkg-whitelist=extensionname" // comma separated
]

// or

"python.linting.pylintArgs": [
    "--unsafe-load-any-extension=y"
]

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Reference

• pyline error codes