学ぶ Common Code Smells in Python | Foundations of Code Quality

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Understanding code smells is essential for anyone aiming to write high-quality Python code. A code smell is a surface indication that usually points to a deeper problem in your codebase. While a code smell is not necessarily a bug, it often signals that your code could be improved for better readability, maintainability, or performance. In Python, some typical code smells include long functions that try to do too much, duplicated code that makes maintenance harder, and magic numbers — hard-coded values with no explanation. These issues can make your code difficult to understand or change, and they often lead to more serious problems as your project grows.


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def process_data(a, b, c, d):
    # This function does too many things at once
    x = a * 3.14159  # What does 3.14159 mean here?
    y = b * 2
    z = c + d
    result = x + y + z
    tmp = result / 42  # Why 42?
    if tmp > 100:
        value = tmp - 10
    else:
        value = tmp + 10
    # Unclear variable names and magic numbers everywhere
    for i in range(0, 10):
        value += i
    return value

1. Which code smell is present in the code sample above?

2. Which of the following are considered code smells in Python?

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