# Python | Convert list of list of strings to list of strings

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Method # 1: Using ` map () + generator expression + join () + isdigit () `
This task can be accomplished using a combination of the above functions ... In this we connect numbers using concatenation and build whole strings. Map () is used to apply logic to each item in the list.

 ` # Python3 code to demonstrate how it works ` ` # Convert list of strings to list of strings ` ` # using map () + expression generator + join () + isdigit () `   ` # helper function ` ` def ` ` convert (sub): ` ` return ` ` "` `". join (ele if ele.isdigit () else "` `" ` ` for ` ` ele ` ` in ` ` sub) `  < br /> ` # initialize the list ` ` test_list ` ` = ` ` [` ` "[1, 4]" ` `, ` ` "[5, 6]" ` `, ` ` "[7, 10]" ` `] `   ` # print original list ` ` print ` ` (` ` "The original list:" ` ` + ` ` str ` ` (test_list)) `   ` # Convert list of strings to list of strings ` ` # using map () + expression generator + join () + isdigit () ` ` res ` ` = ` ` list ` ` (` ` map ` ` (convert, test_list)) `   ` # print result ` ` print ` ` (` ` "List after performing conversion:" ` ` + ` ` str ` ` (res)) `

Output:

` The original list: [’[1, 4]’, ’[5, 6] ’,’ [7, 10] ’] List after performing conversion: [’ 14’, ’56’,’ 710’] `

Method # 2: Using ` eval () ` + list comprehension
A combination of the above functions can be used to accomplish this task. In this case, eval () interprets each string as a list, and then we can convert that list to strings using join (). List comprehension is used to iterate over the list.

 ` # Python3 code to demonstrate how it works ` ` # Convert the list list of strings to list of strings ` ` # using eval () + list comprehension `   ` # initialize the list ` ` test_list ` ` = ` ` [` ` "[1, 4]" ` `, ` ` "[5, 6]" ` `, ` ` "[7, 10]" ` `] `   ` # print the original list ` ` print ` ` (` ` " The original list: "` ` + ` ` str ` ` (test_list)) `   ` # Convert list of strings to list of strings ` ` # using eval () + list comprehension ` ` res ` ` = ` ` [’’ .join (` ` str ` ` (b) ` ` for ` ` b ` ` in ` ` eval ` ` (a)) ` ` for ` ` a ` ` in ` ` test_list] `   ` # print result ` ` print ` ` (` ` " L ist after performing conversion: "` ` + ` ` str ` ` (res)) `

Output:

` The original list: [ ’[1, 4]’, ’[5, 6]’, ’[7, 10]’] List after performing conversion: [’14’,’ 56’, ’710’] `

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