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Python Dictionary Methods

Python Dictionary Methods

Python has a set of built-in methods that dictionary objects can call. All the python dictionary methods are as follow:

Methods Description
clear() The dictionary.clear() method removes all the elements from the dictionary.
copy() The dictionary.copy() method returns a copy of the specified Dictionary.
fromkeys() The dictionary.fromkeys() method returns a dictionary with the specified keys and values.
get() This method returns the value for the given key.
items() The dictionary.items() method returns a list containing a tuple for each key value pair
keys() This method returns View Object of All Keys
pop() The dictionary.pop() method removes and returns element having the specified key.
popitem() This method removes the last inserted key-value pair
setdefault() The dictionary.setdefault() method inserts Key with a Value if Key is not Present and returns the value of the specified key
update() The dictionary.update()updates the dictionary with the specified key-value pairs
values() This method returns a list of all the values in the dictionary

Example 1

 # Python program explaining
 # the dictionary methods
 # initialising the dictionary
 fruits = {
  "banana" : "apple",
   "orange": "mango",
   "grapes": 5
 }
 # printing the Dictionary
 print("Dictionary:",fruits)
 # the setdefault() method
 # returning the value of the key.
 print("The setdefault() method..")
 defaultValue=fruits.setdefault("grapes","vitamin c")
 print("\nValue of the key: \n", defaultValue)
 # the popitem() method
 # pop the last element
 fruits.popitem()
 print("\nAfter poping the last item..")
 print('Remaining dictionary: ', fruits)
 # the pop() method
 # removing the "banana" element from the dictionary.
 leftFruit=fruits.pop("banana")
 print("\nMy final lists of fruits are\n", fruits) 

Output

 Dictionary: {'orange': 'mango', 'banana': 'apple', 'grapes': 5}
 The setdefault() method..
 Value of the key: 
  5
 After poping the last item..
 Remaining dictionary:  {'banana': 'apple', 'grapes': 5}
 My final lists of fruits are
  {'grapes': 5} 

Example 2

 # Python program explaining
 # the dictionary methods
 # initializing the student dictionary
 student = {'studentName': 'Reema','Roll No':'15cs1029'}
 print("The actual Student Details:",student)
 # initializing the second dicitonary with updated values
 updatedStudent= {'studentName': 'Reema','Roll No':'15ME1028','age':22}
 # the dictionary.update() method
 # update the value of key 'Roll' 
 student.update(updatedStudent) 
 print("Student details after updation:") 
 print(student)
 # the dictionary.get() method
 # will return the key value of name and language
 print('Student Name: ', student.get('studentName'))
 print('Roll No: ', student.get('Roll No'))
 # the dictionary.items() method
 # returns a view object that displays a list of a given dictionary's tuple pair
 items = student.items()
 print('Original week list:', items) 

Output

 The actual Student Details: {'studentName': 'Reema', 'Roll No': '15cs1029'}
 Student details after updation:
 {'age': 22, 'studentName': 'Reema', 'Roll No': '15ME1028'}
 Student Name:  Reema
 Roll No:  15ME1028
 Original week list: dict_items([('age', 22), ('studentName', 'Reema'), ('Roll No', '15ME1028')]) 

Example 3

 # Python program explaining
 # the dictionary methods
 # initializing the week dictionary
 week = { 'Monday': 1, 'Tuesday': 2, 'wednesday': 3 ,'Thursday':4,'Friday':5}
 print("Actual dictionary:",week)
 # the dictionary.keys() method
 # Returning a list containing the dictionary's keys
 items = week.keys()
 print('Original week list:', items)
 # the dictionary.copy() method
 # copying the elements of dictionary in dictionary1
 dictionary1 = week.copy()
 print("After copying the dictionary elements in dictionary1...")
 print('dictionary1: ', dictionary1) 
 # the dictionary.clear() method
 # clearing all the elements
 week.clear()
 print('Removing all the element using clear()')
 print('Week List : ', week)
 print('dictionary1: ', dictionary1) 

Output

 Actual dictionary: {'wednesday': 3, 'Friday': 5, 'Tuesday': 2, 'Thursday': 4, 'Monday': 1}
 Original week list: dict_keys(['wednesday', 'Friday', 'Tuesday', 'Thursday', 'Monday'])
 After copying the dictionary elements in dictionary1...
 dictionary1:  {'wednesday': 3, 'Friday': 5, 'Tuesday': 2, 'Thursday': 4, 'Monday': 1}
 Removing all the element using clear()
 Week List :  {}
 dictionary1:  {'wednesday': 3, 'Friday': 5, 'Tuesday': 2, 'Thursday': 4, 'Monday': 1} 



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