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# Python | Build a list of alignment strings for a range N

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Method # 1: Using List Comprehension + `zfill()`
A combination of the above functions can be used to accomplish this task. In this we perform the task of adding numbers using a list comprehension, and zfill () takes care of the length required for each line.

 ` # Python3 code to demonstrate how it works ` ` # Construct N Range Equilength String list ` ` # using a list comprehension + zfill () `   ` # initialize N ` ` N ` ` = ` ` 6 ` ` `  ` # print N ` ` print ` ` (` `" Number of elements required: "` ` + ` ` str ` ` (N)) ` ` `  ` # initialize K ` ` K ` ` = ` ` 3 `   ` # Construct N Range Equilength String list ` ` # using a list comprehension + zfill () ` ` res ` ` = ` ` [` ` str ` ` (ele) .zfill (K) ` ` for ` ` ele ` ` in ` ` range ` ` (N)] `   ` # print result ` ` print ` ` (` ` "K Length range strings list:" ` ` + ` ` str ` ` (res)) `

Output:

` Number of elements required: 6 K Length range strings list: [’000’,’ 001’, ’002’,’ 003’, ’004’, ’005’] `

Method # 2: Using ` map () ` + string formatting
This task can also be done using the above functions. In this, we extend the length logic using string formatting. And it is used to plot the N range.

 ` # Python3 code to demonstrate how it works ` ` # Construct N Range Equilength String list ` ` # using map () + string formatting `   ` # initialize N ` ` N ` ` = ` ` 6 `   ` # print N ` ` print ` ` (` ` "Number of elements required: "` ` + ` ` str ` ` (N)) `   ` # initialize K `  ` K ` ` = ` ` 3 `   ` # Construct N Range Equilength String list ` ` # using map () + string formatting ` ` temp ` ` = ` ` ’{: 0’ ` ` + ` ` str ` ` (K) ` ` + ` ` ’}’ ` ` res ` ` = ` ` list ` ` (` ` map ` ` (temp. ` ` format ` `, ` ` range ` ` (N))) ` ` `  ` # print result ` ` print ` ` (` ` "K Length range strings list:" ` ` + ` ` str ` ` (res)) `

Output:

` Number of elements required: 6 K Length range strings list: [’ 000’, ’001’,’ 002’, ’003’,’ 004’, ’005’] `

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