Python | Embedded Numbers Summation in String List

Last Updated : 22 Apr, 2020

Sometimes, while working with Python lists, we can have problem in which we need to concatenate embedded numbers in Strings list and perform its summation. This can have application in domains dealing with data. Lets discuss certain ways in which this task can be performed.

Method #1 : Using join() + loop
The combination of above functionalities can be used to perform this task. In this, we perform the task of extracting number using join() and loop is used to perform the task of summation.

# Python3 code to demonstrate working of 
# Embedded Numbers Summation in String List
# Using join() + loop
  
# initializing list
test_list = ['g4fg', 'i4s5', 'b9e4st']
  
# printing original list
print("The original list is : " + str(test_list))
  
# Embedded Numbers Summation in String List
# Using join() + loop
res = 0
for sub in test_list:
    res += int(''.join(chr for chr in sub if chr.isdigit()))
      
# printing result 
print("The summation of strings : " + str(res)) 

Output :

The original list is : ['g4fg', 'i4s5', 'b9e4st']
The summation of strings : 143

Method #2 : Using sum() + list comprehension
The combination of above functions can also be used to perform this task. In this, we perform summation using sum() and list comprehension is used to compile string of numbers for summation to work upon.

# Python3 code to demonstrate working of 
# Embedded Numbers Summation in String List
# Using sum() + list comprehension
  
# initializing list
test_list = ['g4fg', 'i4s5', 'b9e4st']
  
# printing original list
print("The original list is : " + str(test_list))
  
# Embedded Numbers Summation in String List
# Using sum() + list comprehension
res = sum([int(''.join(chr for chr in sub if chr.isdigit()))
                                      for sub in test_list])
  
# printing result 
print("The summation of strings : " + str(res)) 

Output :

The original list is : ['g4fg', 'i4s5', 'b9e4st']
The summation of strings : 143

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