Detect `except:` blocks that catch all exceptions indiscriminately. Using a broad `except:` can hide real issues and prevent necessary errors like `KeyboardInterrupt`. Recommend catching specific exceptions instead.
Catching all exceptions with a broad `except:` block hides real issues, including unexpected errors. It can also prevent important exceptions like `KeyboardInterrupt` from stopping the program properly, making debugging more difficult. Always catch specific exceptions instead.
Side-by-side examples engineers can pattern-match during review.
try:
result = 10 / 0
except:
print('An error occurred')try:
result = 10 / 0
except ZeroDivisionError:
print('Cannot divide by zero')try:
result = 10 / 0
except:
print('An error occurred')try:
result = 10 / 0
except ZeroDivisionError:
print('Cannot divide by zero')From the same buckets as this rule.
Check if loops use equality operators (== or !=) in termination conditions. These can lead to infinite loops if the condition is never met exactly. Instead, use relational operators like < or > for safer loop termination.