# Python | Extract length of longest string in a list

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Method # 1: Using ` max () ` + generator expression
A combination of the above functions can be used to accomplish this task. In this, we extract all the lengths of the list using a generator expression and return the maximum of them using max ().

 ` # Python3 code to demonstrate how it works ` ` # Extract the length of the longest line in a list ` ` # using max () + generator expression `   ` # initialize the list ` ` test_list ` ` = ` ` [` `’ gfg’ ` `, ` ` ’is’ ` `, ` `’ best ’` `] ` ` `  ` # print original list ` ` prin t ` ` (` ` "The original list:" ` ` + ` ` str ` ` (test_list)) `   ` # Extract the length of the longest line in a list ` ` # using max () + generator expression ` ` res ` ` = ` ` max ` ` (` ` len ` ` (ele) ` ` for ` ` ele ` ` in ` ` test_list) `   ` # print result ` ` print ` ` (` `" Length of maximum string is: "` ` + ` < code class = "functions"> str ` (res)) `

Output:

` The original list: [’gfg’,’ is’, ’best’] Length of maximum string is: 4 `

Method # 2: Using ` len () + key argument + max () `
A combination of the above functions can be used to accomplish this task. In this, we extract the maximum length using len () and max (). This is faster than the above method because it does more inline tasks rather than generator expression overhead.

 ` # Python3 code to demonstrate how it works ` ` # Extract the length of the longest line in the list ` ` # using len () + the keyword argument + max () `   ` # initialize the list ` ` test_list ` ` = ` ` [` ` ’gfg’ ` `, ` ` ’is’ ` `, ` `’ best’ ` `] `   ` # print original list ` ` print ` ` (` ` "The original list:" ` ` + ` ` str ` ` (test_list)) `   ` # Extract the length of the longest line in the list ` ` # using len ( ) + key argument + max () ` ` res ` ` = ` ` len ` ` (` ` max ` ` (test_list, key ` ` = ` ` len ` `)) `   ` # print result ` ` print ` ` (` ` "Length of maximum string is:" ` ` + str (res)) `

Output:

` The original list: [’gfg’,’ is’, ’best’] Length of maximum string is: 4 `

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