Python program to change values in a Dictionary
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:
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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 dictionarydict = {'hari': 1, 'dita': 2} # original dictionaryprint("initial dictionary-", dict) # changing the key value from 2 to 4dict['dita'] = 4 # dictionary after updateprint("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 dictionarydict1 = {'hari': 1, 'dita': 2} # original dictionaryprint("initial dictionary-", dict1) # list of values which will replace the values of dict1list1 = [3, 5] # this preserves the keys and modifies the valuesdict1 = dict(zip(list(dict1.keys()), list1)) # modified dictionaryprint("dictionary after modification-", dict1) |
Output:
initial dictionary- {‘hari’: 1, ‘dita’: 2}
dictionary after modification- {‘hari’: 3, ‘dita’: 5}
