Python Dict returned from Method has same ID if not assigned [duplicate]

I need more clarification on how python handles the mutable objects when used in return statement.

def dict_return():    d = {'a': "1234"}    return dd1 = dict_return()print("d1 ID: ", id(d1))d2 = dict_return()print("d2 ID: ", id(d2))print("Dict Return ID1: ", id(dict_return()))print("Dict Return ID2: ", id(dict_return()))

I have above code sample the output is as below:

d1 ID:  6017792d2 ID:  6018128Dict Return ID1:  33645696Dict Return ID2:  33645696

I'm using Python V3.6.3, as can be seen the last two lines have the same ID but when I assign the returned dict to variable, new variables are created. I want more clarification on why this happens if dict are mutable in Python.