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Python program to Increment Numeric Strings by K
• Last Updated : 11 Dec, 2020

Given the Strings list, write a Python program to increment strings that are numeric by K.

Examples:

Input : test_list = [“gfg”, “234”, “is”, “98”, “123”, “best”, “4”], K = 6
Output : [‘gfg’, ‘240’, ‘is’, ‘104’, ‘129’, ‘best’, ’10’]
Explanation : 234, 98 and 4 are incremented by 6 in result.

Input : test_list = [“gfg”, “234”, “is”, “98”, “123”, “best”, “4”], K = 4
Output : [‘gfg’, ‘238’, ‘is’, ‘102’, ‘129’, ‘best’, ‘8’]
Explanation : 234, 98 and 4 are incremented by 4 in result.

Method #1 : Using str() + int() + loop + isdigit()

In this, we perform task of interconversion of elements using str() + int(), and check for number using isdigit(), iteration is done using loop.

## Python3

 `# Python3 code to demonstrate working of``# Increment Numeric Strings by K``# Using str() + int() + loop + isdigit()`` ` `# initializing Matrix``test_list ``=` `[``"gfg"``, ``"234"``, ``"is"``, ``"98"``, ``"123"``, ``"best"``, ``"4"``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# initializing K``K ``=` `6`` ` `res ``=` `[]``for` `ele ``in` `test_list:`` ` `    ``# incrementing on testing for digit.``    ``if` `ele.isdigit():``        ``res.append(``str``(``int``(ele) ``+` `K))``    ``else``:``        ``res.append(ele)`` ` `# printing result``print``(``"Incremented Numeric Strings : "` `+` `str``(res))`

Output:

The original list is : [‘gfg’, ‘234’, ‘is’, ’98’, ‘123’, ‘best’, ‘4’]
Incremented Numeric Strings : [‘gfg’, ‘240’, ‘is’, ‘104’, ‘129’, ‘best’, ’10’]

Method #2 : Using list comprehension + isdigit()

This is one of the ways in which this task can be performed. Similar to above, just one line alternative to compact the solution using list comprehension.

## Python3

 `# Python3 code to demonstrate working of``# Increment Numeric Strings by K``# Using list comprehension + isdigit()`` ` `# initializing Matrix``test_list ``=` `[``"gfg"``, ``"234"``, ``"is"``, ``"98"``, ``"123"``, ``"best"``, ``"4"``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# initializing K``K ``=` `6`` ` `# increment Numeric digits.``res ``=` `[``str``(``int``(ele) ``+` `K) ``if` `ele.isdigit() ``else` `ele ``for` `ele ``in` `test_list]`` ` `# printing result``print``(``"Incremented Numeric Strings : "` `+` `str``(res))`

Output:

The original list is : [‘gfg’, ‘234’, ‘is’, ’98’, ‘123’, ‘best’, ‘4’]
Incremented Numeric Strings : [‘gfg’, ‘240’, ‘is’, ‘104’, ‘129’, ‘best’, ’10’]

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