unnecessary-list-comprehension-dict (C404)

Derived from the flake8-comprehensions linter.

Fix is always available.

What it does

Checks for unnecessary list comprehensions.

It's unnecessary to use a list comprehension inside a call to dict, since there is an equivalent comprehension for this type.

dict([(x, f(x)) for x in foo])

Use instead:

{x: f(x) for x in foo}

This rule's fix is marked as unsafe, as it may occasionally drop comments when rewriting the call. In most cases, though, comments will be preserved.