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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