Python Dictionary update() method

Python Dictionary update() method

The dictionary.update() method in Python inserts the specified items to the dictionary.

Syntax

dictionary.update(iterable)

Parameter

iterable- This parameter represents a dictionary or an iterable object with key value pairs, that will be inserted to the dictionary.

Return

None

Example 1

 # Python program explaining
 # the dictionary.update() method
 # initializing the 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}
 # update the value of key 'Roll' 
 student.update(updatedStudent) 
 print("Student details after updation:") 
 print(student) 

Output

 The actual Student Details: {'studentName': 'Reema', 'Roll No': '15cs1029'}
 Dictionary after updation:
 {'studentName': 'Reema', 'Roll No': '15ME1028', 'age': 22} 

Example 2

 # Python program explaining
 # the dictionary.update() method
 # Initializing the dictionary with single item
 Value = { 'A' : 'Reema'} 
 # The Dictionary before Updation 
 print("Original Dictionary:") 
 print(Value) 
 # update the Dictionary with iterable 
 Value.update(B = 'Writing', C = '22') 
 print("Dictionary after updation:") 
 print(Value) 

Output

 Original Dictionary:
 {'A': 'Reema'}
 Dictionary after updation:
 {'B': 'Writing', 'C': '22', 'A': 'Reema'}