Python – Custom space size padding in Strings List

• Last Updated : 24 Feb, 2021

In this article given a Strings List, the task is to write a Python program to pad each string with spaces with specified leading and trailing number of spaces required.

Examples:

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Input: test_list = [“Gfg”, “is”, “Best”], lead_size = 3, trail_size = 2

Output: [‘   Gfg  ‘, ‘   is  ‘, ‘   Best  ‘]

Explanation: Each word starts after 3 spaces and add 2 spaces after completion.

Input: test_list = [“Gfg”, “Best”], lead_size = 3, trail_size = 2

Output: [‘   Gfg  ‘, ‘   Best  ‘]

Explanation: Each word starts after 3 spaces and add 2 spaces after completion.

Method #1: Using loop

In this, we perform the task of adding trailing and leading required spaces using loop. The * operator is used to get required number of spaces.

Python3

 `# Python3 code to demonstrate working of ` `# Custom space size padding in Strings List ` `# Using loop ` ` `  `# initializing lists ` `test_list ``=` `[``"Gfg"``, ``"is"``, ``"Best"``] ` ` `  `# printing original list ` `print``(``"The original list is : "` `+` `str``(test_list)) ` ` `  `# initializing padding numbers ` `lead_size ``=` `3` `trail_size ``=` `2` ` `  `res ``=` `[] ` `for` `ele ``in` `test_list: ` ` `  `    ``# * operator handles number of spaces ` `    ``res.append((lead_size ``*` `' '``) ``+` `ele ``+` `(trail_size ``*` `' '``)) ` ` `  `# printing result ` `print``(``"Padded Strings : "` `+` `str``(res)) `

Output:

```The original list is : ['Gfg', 'is', 'Best']
Padded Strings : ['   Gfg  ', '   is  ', '   Best  ']```

Method #2: Using list comprehension

Similar way as above, the only difference being the use of list comprehension as a one-liner alternative to solve problems.

Python3

 `# Python3 code to demonstrate working of ` `# Custom space size padding in Strings List ` `# Using list comprehension ` ` `  `# initializing lists ` `test_list ``=` `[``"Gfg"``, ``"is"``, ``"Best"``] ` ` `  `# printing original list ` `print``(``"The original list is : "` `+` `str``(test_list)) ` ` `  `# initializing padding numbers ` `lead_size ``=` `3` `trail_size ``=` `2` ` `  `# using list comprehension for one liner alternative ` `res ``=` `[(lead_size ``*` `' '``) ``+` `ele ``+` `(trail_size ``*` `' '``) ``for` `ele ``in` `test_list] ` ` `  `# printing result ` `print``(``"Padded Strings : "` `+` `str``(res)) `

Output:

```The original list is : ['Gfg', 'is', 'Best']
Padded Strings : ['   Gfg  ', '   is  ', '   Best  ']```

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