Lære Avoiding Anti-Patterns | Pythonic Best Practices

Understanding and avoiding anti-patterns is essential for writing high-quality Python code. An anti-pattern is a common but ineffective or counterproductive coding practice that often emerges from a lack of experience or misunderstanding of best practices.

In Python, anti-patterns can take many forms, but some of the most prevalent include:

Unnecessary complexity: code that is more complicated than needed, making it harder to read, test, and maintain;
Misuse of data structures: using lists where sets would be more appropriate, or vice versa, leading to inefficient and confusing code;
Poor exception handling: catching overly broad exceptions or ignoring exceptions altogether, which can mask errors and make debugging difficult.

By recognizing these patterns and replacing them with more Pythonic solutions, you can write code that is clearer, more efficient, and easier to maintain.


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# Anti-pattern: Using unnecessary loops and complexity to check for duplicates
def has_duplicates(lst):
    for i in range(len(lst)):
        for j in range(i + 1, len(lst)):
            if lst[i] == lst[j]:
                return True
    return False

# Pythonic version: Using a set for efficient duplicate checking
def has_duplicates_pythonic(lst):
    return len(lst) != len(set(lst))

# Example usage
numbers = [1, 2, 3, 2]
print(has_duplicates(numbers))         # Output: True
print(has_duplicates_pythonic(numbers))  # Output: True

1. Which of the following best describes an anti-pattern?

2. Fill in the blank to identify the anti-pattern in the exception handling in this code snippet.

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