Dictionaries in Python are mutable, so copying them correctly is important.
If you copy a dictionary incorrectly, changes in one dictionary may affect the other.

Deep Copy :
           Here , the copied dictionary variable refer to the same dictionary. Modifing one dictionary will affect the other. 
Python 
a = {"name": "Rahul"} b = a # not a real copy b["name"] = "Arun" print(a) #output {'name': 'Arun'}

Shallow Copy
               Here , both variable will point to different object . So changes made in original will not affect the duplicate.
               copy( ) method is used to create a copy of original dictionary

Python
student = {"name": "Rahul", "age": 22} new_dict = student.copy() print(new_dict) new_dict["age"] = 25 print(student) print(new_dict) #output {'name': 'Rahul', 'age': 22} {'name': 'Rahul', 'age': 25}

using dict( ) method :
                       built-in method to make copy of a dictionary
Python 
thisdict = { "brand": "Ford", "model": "Mustang", "year": 1964 } mydict = dict(thisdict) print(mydict) #output