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multiple-with-statements (SIM117)

Added in v0.0.211 · Related issues · View source

Derived from the flake8-simplify linter.

Fix is sometimes available.

What it does

Checks for the unnecessary nesting of multiple consecutive context managers.

Why is this bad?

In Python 3, a single with block can include multiple context managers.

Combining multiple context managers into a single with statement will minimize the indentation depth of the code, making it more readable.

The following context managers are exempt when used as standalone statements:

  • anyio.{CancelScope, fail_after, move_on_after}
  • asyncio.{timeout, timeout_at}
  • trio.{fail_after, fail_at, move_on_after, move_on_at}

Example

with A() as a:
    with B() as b:
        pass

Use instead:

with A() as a, B() as b:
    pass

References