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# Python | Replace the tuple according to the Nth element of the tuple

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Method # 1: Using loop + `enumerate()`
This task can be accomplished using a combination of loops and an enumeration function that can help access Nth element and then check and replace when the condition is met.

 ` # Python3 code to demonstrate how it works ` ` # Replace the tuple according to the Nth element of the tuple ` ` # Using loops + enumerate () `   ` # Initializing list ` ` test_list ` ` = ` ` [(` ` ’gfg’ ` `, ` ` 1 ` `), (` `’ was’ ` `, ` ` 2 ` `), (` ` ’best’ ` `, ` ` 3 ` `)] `   ` # print original list ` ` print ` ` (` ` "The original list is:" ` ` + ` ` str ` ` (test_list)) `   ` # Initialize change recording ` ` repl_rec ` ` = ` ` (` ` ’is’ ` `, ` ` 2 ` `) `   ` # Initializing N ` ` N ` ` = ` ` 1 `   ` # Replace the tuple according to the Nth element of the tuple ` ` # Using loops + enumerate () ` ` for ` ` key, val ` ` in ` ` enumerate ` ` (test_list): ` ` if ` ` val [N] ` ` = ` ` = ` ` repl_rec [N]: ` ` test_list [key] ` ` = ` ` repl_rec ` ` ` ` break ` ` `  ` # print result ` ` print ` ` (` ` "The tuple after replacement is:" ` ` + ` ` str ` ` (test_list) ) `

Output:

` The original list is: [(’gfg’, 1), (’ was’, 2), (’best’, 3)] The tuple after replacement is: [(’ gfg’, 1), (’is’, 2) , (’best’, 3)] `

Method # 2: Using List Comprehension
This is a one-line approach to solve this particular problem. In this we simply iterate over the list element and continue matching the corresponding Nth element of the tuple and performing the replacement.

 ` # Python3 code to demonstrate how it works ` ` # Replace the tuple according to the Nth element of the tuple ` ` # Using the comprehension list `   ` # Initializing list ` ` test_list ` ` = ` ` [(` ` ’gfg’ ` `, ` ` 1 ` `), (` ` ’was’ ` `, ` ` 2 ` `), (` ` ’best’ ` `, ` ` 3 ` `)] `   ` # print the original list ` ` print ` ` (` ` " The original list is: "` ` + ` ` str ` ` (test_list)) `   ` # Initialize a change record ` ` repl_rec ` ` = ` ` (` ` ’is’ ` `, ` ` 2 ` `) `   ` # Initialization N ` ` N ` ` = ` ` 1 `   ` # Replace with rte according to the Nth element of the tuple ` ` # Using the comprehension list ` ` res ` ` = ` ` [repl_rec ` ` if ` ` sub [N] ` ` = ` ` = ` ` repl_rec [N] ` ` else ` ` sub ` ` for ` ` sub ` ` in ` ` test_list] `   ` # print result ` ` print ` ` (` ` "The tuple after replacement is:" ` ` + ` ` str ` ` (res)) `

Output:

` The origina l list is: [(’gfg’, 1), (’ was’, 2), (’best’, 3)] The tuple after replacement is: [(’ gfg’, 1), (’is’, 2 ), (’best’, 3)] `

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