assignment-from-none / E1128

Message emitted:

Assigning result of a function call, where the function returns None

Description:

Used when an assignment is done on a function call but the inferred function returns nothing but None.

Problematic code:

def function():
    return None


f = function()  # [assignment-from-none]

Correct code:

def function():
    return None


f = function() if function() else 1

Created by the typecheck checker.