import random
class First_class:
  def __init__(self):
    x = random.randint(0, 1000)
class Second_class:
  def __init__(self, y):
    y = First_class()
obj_1 = First_class()
obj_2 = Second_class(obj_1)

 y.x = random.randint(0, 1000)

 #
import random
class First_class:
  def __init__(self):
    x = random.randint(0, 1000)
class Second_class:
  def __init__(self):
    pass
def create_second_class():
    obj1 = First_class()
    obj2 = Second_class()
    return obj2, obj1
obj_1 = First_class()
print(id(obj_1), type(obj_1))
obj_2, obj_1 = create_second_class()
print(id(obj_1), type(obj_1), id(obj_2), type(obj_2))
>>> 
51199856 <class '__main__.First_class'>
51199824 <class '__main__.First_class'> 51228816 <class '__main__.Second_class'>
>>> 

 content = { int_value: ("text_value", data_1, data_2, ...), ...}