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# 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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