id: no-method-field-name-collision
valid:
  - |
    class Foo:
        def get_x(self):
            return self._x
  - |
    class Foo:
        x = 0  # class variable, not method
  - |
    def external_function():
        pass
  - |
    class Foo:
        def get_x(self):
            return self.x  # same case, no collision
invalid:
  - |
    class Foo:
        def get_X(self):
            pass
        def __init__(self):
            self.x = 1  # x vs get_X - different case