Introduction to Wemake Python Styleguide

Wemake Python Styleguide is a comprehensive and strict linter designed to enforce the best practices and coding standards in Python. It helps developers write consistent, clean, and efficient Python code by providing dozens of useful APIs.

Key APIs with Code Examples

1. Enforcing Consistent Naming Conventions

Naming conventions are crucial for code readability. The styleguide enforces PEP-8 naming conventions, ensuring consistency across your codebase.

 # Bad example VAR = 42
# Good example variable = 42 

2. Restricting Function Complexity

Complex functions can be difficult to understand and maintain. The styleguide provides a WPS231 rule to restrict function complexity.

 # Bad example: function too complex def complex_function(x, y, z):
    if x > y:
        return x + z
    elif x < y:
        return y - z
    else:
        return x * y * z

# Good example def simple_function(a, b):
    return a + b

3. Avoiding Overuse of Magic Numbers

Magic numbers can be confusing and difficult to maintain. Replace them with named constants using WPS432.

 # Bad example def calculate_discount(price):
    return price * 0.95

# Good example DISCOUNT_RATE = 0.95
def calculate_discount(price):
    return price * DISCOUNT_RATE

4. Limiting Line Length

Long lines can be hard to read. The styleguide enforces PEP-8's 79 character line limit using WPS300.

 # Bad example def fetch_data_from_api(endpoint_url, use_cache=False, retries=3, timeout=10):
    pass

# Good example def fetch_data(endpoint_url, use_cache=False, retries=3, timeout=10):
    pass

Building an Application with Wemake Python Styleguide

Here's an example of a simple Flask application that follows the rules enforced by Wemake Python Styleguide:

 from flask import Flask, jsonify
app = Flask(__name__)
@app.route('/') def home():
    message = 'Welcome to the Flask app'
    return jsonify(message=message)

if __name__ == '__main__':
    app.run(debug=True)

In this Flask application, we adhere to naming conventions, keep functions simple, avoid magic numbers, and ensure lines are of appropriate length. By following Wemake Python Styleguide, we create clean, maintainable, and readable code.

For more details, visit the official Wemake Python Styleguide documentation.

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