Skip to content
Related Articles

Related Articles

Improve Article

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]

 Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.  

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course




My Personal Notes arrow_drop_up
Recommended Articles
Page :