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

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`] `