Python – Variable Operations Dictionary update

Last Updated : 22 Jun, 2021

Sometimes, while working with Python dictionaries we can have a problem in which we need to perform a population of dictionary values using assigned variables after certain operation among them. This can have application in day-day programming. Let’s discuss certain ways in which this task can be performed.
Method #1 : Using lambda + dictionary comprehension
The combination of above functions can be used to solve this problem. In this, we perform the assignment using dictionary comprehension and values computations using lambda functions.

Python3

# Python3 code to demonstrate working of
# Variable Operations Dictionary update
# Using lambda + dictionary comprehension
 
# helper functions
helper_fnc = {'Gfg': lambda: x + y,
         'best': lambda: x * y}
 
# initializing variables
x = 6
y = 7
 
# Variable Operations Dictionary update
# Using lambda + dictionary comprehension
res = {key: val() for key, val in hlper_fnc.items()}
 
# printing result
print("The Initialized dictionary : " + str(res))

Output :

The Initialized dictionary : {'best': 42, 'Gfg': 13}

Method #2 : Using operators library
This task can also be performed using above functionality. In this, we use inbuilt operations provided by the operator library to achieve this task.

Python3

# Python3 code to demonstrate working of
# Variable Operations Dictionary update
# Using lambda + dictionary comprehension
from operator import add, mul
 
# helper functions
helper_fnc = {'Gfg': add,
         'best': mul}
 
# initializing variables
x = 6
y = 7
 
# Variable Operations Dictionary update
# Using lambda + dictionary comprehension
res = {'Gfg' : hlper_fnc['Gfg'](x, y), 'best' : hlper_fnc['best'](x, y)}
 
# printing result
print("The Initialized dictionary : " + str(res))

Output :

The Initialized dictionary : {'best': 42, 'Gfg': 13}

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