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binary-op-exception (PLW0711)

Added in v0.0.258 · Related issues · View source

Derived from the Pylint linter.

What it does

Checks for except clauses that attempt to catch multiple exceptions with a binary operation (and or or).

Why is this bad?

A binary operation will not catch multiple exceptions. Instead, the binary operation will be evaluated first, and the result of that operation will be caught (for an or operation, this is typically the first exception in the list). This is almost never the desired behavior.

Example

try:
    pass
except A or B:
    pass

Use instead:

try:
    pass
except (A, B):
    pass