Given a dictionary in Python, the task is to write a Python program to change the value in one of the key-value pairs. This article discusses mechanisms to do this effectively.
Examples:
Input: {'hari': 1, 'dita': 2} Output: {'hari': 1, 'dita': 4} Input: {'hari': 1, 'dita': 2} Output: {'hari': 3, 'dita': 5}
Changing Values of a Dictionary
Method 1
In this we refer to the key of the value to be changed and supply it with a new value.
Example:
Python3
# declaring dictionary dict = { 'hari' : 1 , 'dita' : 2 } # original dictionary print ( "initial dictionary-" , dict ) # changing the key value from 2 to 4 dict [ 'dita' ] = 4 # dictionary after update print ( "dictionary after modification-" , dict ) |
Output:
initial dictionary- {‘hari’: 1, ‘dita’: 2}
dictionary after modification- {‘hari’: 1, ‘dita’: 4}
Method 2:
In this method we use zip() function, which aggregates the iterable and combines them into a tuple form.
Example:
Python3
# declaring dictionary dict1 = { 'hari' : 1 , 'dita' : 2 } # original dictionary print ( "initial dictionary-" , dict1) # list of values which will replace the values of dict1 list1 = [ 3 , 5 ] # this preserves the keys and modifies the values dict1 = dict ( zip ( list (dict1.keys()), list1)) # modified dictionary print ( "dictionary after modification-" , dict1) |
Output:
initial dictionary- {‘hari’: 1, ‘dita’: 2}
dictionary after modification- {‘hari’: 3, ‘dita’: 5}
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