reference.py

//example1
dict1 = {1: 2}
dict2 = dict1
dict1[1] = 3
print(dict2)
#{1: 3}

//example2
dict1 = {1: 2}
dict2 = dict1.copy()
dict1[1] = 3
print(dict2)
#{1: 2}

//example3
dict3 = {"ref": dict2}
dict4 = dict3.copy()
dict2[1]=5566
print(dict4)
#{'ref': {1: 5566}}