example.py

class ABC():
	
	def __init__(my_parameter):
		self.my_object_variable = my_parameter

	def whatever_shit():
		print(self.my_object_variable)

	def return_value():
		return self.my_object_variable

class Xyz():
	
	def __init__(my_parameter_holding_another_object):
		self.my_object_variable = my_parameter_holding_another_object

	def return_subobject_value():
		return self.my_object_variable.return_value()



instance = ABC("this is the parameter")

instance.whatever_shit()

second_instance = Xyz(instance)

assert second_instance.return_subobject_value() == instance.return_value()