In order to be callable, a python class should implement the __call__ method.

This rule raises an issue when a non-callable object is called.

Noncompliant Code Example

class MyClass:
    pass

myvar = MyClass()
myvar()  # Noncompliant

none_var = None
none_var()  # Noncompliant

Compliant Solution

class MyClass:
    def __call__(self):
        print("called")

myvar = MyClass()
myvar()

See