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try-consider-else (TRY300)#

Derived from the tryceratops linter.

What it does#

Checks for return statements in try blocks.

Why is this bad?#

The try-except statement has an else clause for code that should run only if no exceptions were raised. Using the else clause is more explicit than using a return statement inside of a try block.

Example#

import logging


def reciprocal(n):
    try:
        rec = 1 / n
        print(f"reciprocal of {n} is {rec}")
        return rec
    except ZeroDivisionError:
        logging.exception("Exception occurred")

Use instead:

import logging


def reciprocal(n):
    try:
        rec = 1 / n
    except ZeroDivisionError:
        logging.exception("Exception occurred")
    else:
        print(f"reciprocal of {n} is {rec}")
        return rec

References#