 # Python — Get the sum of numbers in a list of strings

Method # 1: Using loop + `int()`
This is a brute force method to accomplish this task. In this, we start a loop for the entire list, convert each line to an integer, and do the summation over the list and store in a separate list.

` `

``` # Python3 code to demonstrate how it works # Summing lists of string integers # using loop + int ()   # initialize the list test_list = [[[ ` 1` , `4` ], [ `5` , ` 6` ], [ `7` , `10` ]]    # print original list print ( " The original list: " + str (test_list) )   # Summing lists of string integers # using loop + int () res = [] for sub in test_list: par_sum = 0   for ele in sub: par_sum = par_sum + int (ele) res.append (par_sum)   # print result print ( "List after summation of nested string lists:" + str (res)) ```

` ` Output:

` The original list: [[`1`,` 4`], [`5`,` 6`], [`7`,` 10 `]] List after summation of nested string lists: [5, 11, 17] `

Method # 2: Using ` sum () + int () ` + comprehension list
This is shorthand to accomplish this task. In this we loop through the lists using comprehension and extract the sum using sum ().

 ` # Python3 code to demonstrate how it works ` ` # Summing lists of string integers ` ` # using sum () + int () + list comprehension `   ` # initialize the list ` ` test_list ` ` = ` ` [[[` `` 1` ` `, ` ` `4` ` `], [` ` `5` ` `, ` `` 6` ` `], [` ` `7` ` `, ` `` 10` ` `]] ` ` `  ` # print original list ` ` print ` ` (` ` "The original list:" ` ` + ` ` str ` ` (test_list)) `   ` # Summing lists of string integers ` ` # using sum () + int () + list comprehension ` ` res ` ` = ` ` [` ` sum ` ` (` ` int ` ` (ele) ` ` for ` ` ele ` ` in ` ` sub) ` ` for ` ` sub ` ` in ` ` test_list] `   ` # print result ` ` print ` ` (` ` " List after summation of nested string lists: "` ` + ` ` str ` ` (res) ) `

Output:

``` The original list: [[`1`,` 4`], [`5`,` 6`], [`7`,` 10`]] List after summation of nested string lists: [5, 11, 17]

```