Python – Dictionary values String Length Summation

Sometimes, while working with Python dictionaries we can have problem in which we need to perform the summation of all the string lengths which as present as dictionary values. This can have application in many domains such as web development and day-day programming. Lets discuss certain ways in which this task can be performed.

Method #1 : Using sum() + generator expression + len()
The combination of above functions can be used to perform this task. In this, we compute length using len(), summation using sum() and iteration using generator expression.

# Python3 code to demonstrate working of
# Dictionary values String Length Summation
# Using sum() + len() + generator expression
from collections import ChainMap

# initializing dictionary
test_dict = {'gfg' : '2345',
             'is' : 'abcde',
             'best' : 'qwerty'}

# printing original dictionary
print("The original dictionary is : " + str(test_dict))

# Dictionary values String Length Summation
# Using sum() + len() + generator expression
res = sum((len(val) for val in test_dict.values()))

# printing result
print("The string values length summation : " + str(res))

Output :

The original dictionary is : {‘is’: ‘abcde’, ‘best’: ‘qwerty’, ‘gfg’: ‘2345’}
The string values length summation : 15

Method #2 : Using map() + len() + sum()
This performs the task similar to above function. The only difference is that iteration is performed using map() than generator expression.

# Python3 code to demonstrate working of
# Dictionary values String Length Summation
# Using map() + len() + sum()

# initializing dictionary
test_dict = {'gfg' : '2345',
             'is' : 'abcde',
             'best' : 'qwerty'}

# printing original dictionary
print("The original dictionary is : " + str(test_dict))

# Dictionary values String Length Summation
# Using map() + len() + sum()
res = sum(map(len, test_dict.values()))

# printing result
print("The string values length summation : " + str(res))

Output :

The original dictionary is : {‘is’: ‘abcde’, ‘best’: ‘qwerty’, ‘gfg’: ‘2345’}
The string values length summation : 15