Python Dictionary keys() method

Python Dictionary keys() method

The dictionary.keys() method in Python returns a view object that displays a list of all the keys in the dictionary

Syntax

dictionary.keys()

Parameter

NA

Return

This method returns a view object that displays a list of all the keys in the dictionary

Example 1

 # the python program representing
 # the dictionary.keys() method
 # initializing the dictionary
 fruits = {
  "banana": "apple",
   "orange": "mango",
   "grapes": 5
 }
 # printing the Dictionary
 print("Dictionary:",fruits)
 # returning a view object that displays a list of all the keys in the dictionary
 keysItem= fruits.keys()
 # printing the keys 
 print("The items in the dictionary are:",keysItem) 

Output

Dictionary: {'grapes': 5, 'orange': 'mango', 'banana': 'apple'}
The items in the dictionary are: dict_keys(['grapes', 'orange', 'banana'])

Example 2

 # the python program representing
 # the dictionary.keys() method
 # initializing the week dictionary
 week = { 'Monday': 1, 'Tuesday': 2, 'wednesday': 3 ,'Thursday':4,'Friday':5}
 items = week.keys()
 print('Original week list:', items)
 # deleting an item from the week dictionary
 del[week['Thursday']]
 # returning a view object that displays a list of all the keys in the dictionary
 print('Updated week list:', items) 

Output

Original week list: dict_keys(['Tuesday', 'Friday', 'Monday', 'Thursday', 'wednesday'])
Updated week list: dict_keys(['Tuesday', 'Friday', 'Monday', 'wednesday'])

Example 3

 # the python program representing
 # the dictionary.keys() method
 # intializing Dictionary with two keys 
 Dictionary = {'1. ': 'Tutorials', '2. ': 'And'} 
 # Printing the keys of dictionary 
 print("Keys before Dictionary Updation:") 
 keys = Dictionary.keys() 
 print(keys) 
 # adding an element to the dictionary 
 Dictionary.update({'3.':'Examples'}) 
 print('\nAfter updating the dictionary...') 
 print(keys) 

Output

 Keys before Dictionary Updation:
 dict_keys(['2. ', '1. '])
 After updating the dictionary...
 dict_keys(['2. ', '1. ', '3.'])