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    Python Advanced

    Pylint Usage in Python

    By Meenakshi AgarwalUpdated:Nov 23, 2023No Comments3 Mins Read
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    From this tutorial, you will be learning about Pylint in Python. It is a static code analysis tool to find coding errors in your Python code.

    Note: The syntax used in the below section is for Python 3. You may change it to use a different version of Python.

    Learn about Pylint

    • What is Pylint?
    • How to install and use Pylint?
    • Program Example
    Pylint Tool Usage
    Pylint Tool

    Must Read – Best Python IDE

    What is Pylint?

    It is a static code analysis tool to identify errors in Python code and helps programmers enforce good coding styles. This tool enables them to debug complex code with less manual work.

    It is one of the tools that gets used for test-driven development (TDD).

    The coding style that Pylint applies to the code is known as PEP8.

    For more information, about PEP8 visit the link: PEP8 Style Guide for Python

    Other products which are similar to Pylint are Pyflakes, Mypy, etc.

    It is a must-have tool for every beginner as well as advanced users. It scans and rates programs with a score according to the rules outlined in the PEP8 style guide.

    How to install and use Pylint?

    To install it on systems such as Windows 10, Mac OS, and Linux, use the following command:

    pip install pylint

    You can also use alternative methods such as:

    1. On Debian, Kali Linux, and Ubuntu-based systems such as Ubuntu, Elementary, etc.

    # Debian, Kali Linux, Ubuntu
    sudo apt install pylint

    2. On Fedora

    # Fedora
    sudo dnf install pylint

    3. On OpenSUSE

    # OpenSUSE
    sudo zypper install pylint

    or

    # OpenSUSE
    sudo zypper install python3-pylint

    You can even integrate Pylint into various IDE (Integrated Development Environment) such as Eclipse, Visual Studio Code, etc. However, here, we will focus on Pylint usage without using IDE integration.

    See also  Decorators in Python

    The command to use Pylint on a Python file is:

    # Check for style errors
    pylint filename.py

    It returns output consisting of semantic errors, syntax errors, errors in coding style, bugs in the code, excessive and redundant code, etc. It also assigns a score that indicates whether the Python code is an ideal one to use and maintains a history of scores obtained while running over a Python file as well as after each edit.

    In the next section, you can check out sample programs demonstrating its usage.

    Program Example

    Here is simple Python code where we ran Pytlint. In the output, you can see the -10 rating and find the suggestions. After addressing the issues, the final code is clean and rated 10/10.

    Python program with style issues:

    Here is a simple program (sample.py) that has some styling issues.

    a = 23
    b = 45
    c = a + b
    
    print(c)

    Run pylint

    Below is the output after you pass the above sample to Pylint. It lists multiple styling issues in the program.

    Check This: The Best 30 Python Questions on Lists, Tuples, and Dictionaries

    Use Pylint to detect errors

    A better version of the above sample:

    After fixing the code, the modified version looks like this:

    """
    Code to add two numbers
    """
    
    a = 23
    b = 45
    c = a + b
    
    print(c)

    The output will come as:

    Re-run to verify

    Best,

    TechBeamers

    Previous ArticleCopy Module in Python
    Next Article Decorators in Python
    Meenakshi Agarwal

    I'm Meenakshi Agarwal, founder of TechBeamers.com, with 10+ years of experience in Software development, testing, and automation. Proficient in Python, Java, Selenium, SQL, & C-Sharp, I create tutorials, quizzes, exercises and interview questions on diverse tech topics. Follow my tutorials for valuable insights!

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