type-comparison (E721)

Derived from the pycodestyle linter.

What it does

Checks for object type comparisons using == and other comparison operators.

Why is this bad?

Unlike a direct type comparison, isinstance will also check if an object is an instance of a class or a subclass thereof.

Under preview mode, this rule also allows for direct type comparisons using is and is not, to check for exact type equality (while still forbidding comparisons using == and !=).

Example

if type(obj) == type(1):
    pass

if type(obj) == int:
    pass

Use instead:

if isinstance(obj, int):
    pass