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# Python – Integers String to Integer List

• Last Updated : 05 Sep, 2020

Given a Integers String, composed of negative and positive numbers, convert to integer list.

Input : test_str = ‘4 5 -3 2 -100 -2’
Output : [4, 5, -3, 2, -100, -2]
Explanation : Negative and positive string numbers converted to integers list.

Input : test_str = ‘-4 -5 -3 2 -100 -2’
Output : [-4, -5, -3, 2, -100, -2]
Explanation : Negative and positive string numbers converted to integers list.

Method #1 : Using list comprehension + int() + split()

In this, we split integers using split() and int() is used to integral conversion. Elements inserted in List using list comprehension

## Python3

 `# Python3 code to demonstrate working of ``# Integers String to Integer List``# Using list comprehension + int() + split()``import` `string`` ` `# initializing string``test_str ``=` `'4 5 -3 2 -100 -2 -4 9'`` ` `# printing original string``print``(``"The original string is : "` `+` `str``(test_str))`` ` `# int() converts to required integers``res ``=` `[``int``(ele) ``for` `ele ``in` `test_str.split()]``     ` `# printing result ``print``(``"Converted Integers : "` `+` `str``(res)) `
Output
```The original string is : 4 5 -3 2 -100 -2 -4 9
Converted Integers : [4, 5, -3, 2, -100, -2, -4, 9]
```

Method #2 : Using map() + int()

In this, the task of extension of logic of integer conversion is done using map().

## Python3

 `# Python3 code to demonstrate working of ``# Integers String to Integer List``# Using map() + int()``import` `string`` ` `# initializing string``test_str ``=` `'4 5 -3 2 -100 -2 -4 9'`` ` `# printing original string``print``(``"The original string is : "` `+` `str``(test_str))`` ` `# int() converts to required integers``# map() extends logic of int to each split``res ``=` `list``(``map``(``int``, test_str.split()))``     ` `# printing result ``print``(``"Converted Integers : "` `+` `str``(res)) `
Output
```The original string is : 4 5 -3 2 -100 -2 -4 9
Converted Integers : [4, 5, -3, 2, -100, -2, -4, 9]
```

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