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Sourcery Sourcery

Raise From Previous Error

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Sourcery refactoring id: raise-from-previous-error

Section titled “Sourcery refactoring id: raise-from-previous-error”

Description:

Section titled “Description:”

Suggests raising from a previously-raised exception.

Before:

Section titled “Before:”
x = int(input())


try:
    print(1 / x)
except ZeroDivisionError:
    raise ValueError("Can't divide by zero")

After:

Section titled “After:”
x = int(input())


try:
    print(1 / x)
except ZeroDivisionError as e:
    raise ValueError("Can't divide by zero") from e

Explanation:

Section titled “Explanation:”

Exception chaining was introduced in Python 3 PEP 3134, and is an implicit part of exception handling. This suggestion converts the implicit exception chain into an explicit one, as suggested by Pylint’s raise-missing-from error.