HowTo: Python Convert a String Into Integer

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How do I convert a string such as x=’12345′ to an integer (int) under Python programming language? How can I parse python string to integer?

You need to use int(s) to convert a string or number to an integer. For testing purpose, defined a string called x=’123456′, run:

You may also need to use float(s) to convert a string or number to a floating point number or combination of both as follows:


int(s)
float(s)
int(float(s))

Examples

x = '123456'

Confirm the object type:

type(x)

Sample outputs:

<type 'str'>

Convert a string to an int and store it to i, run:

i = int(x)
type(i)

Sample outputs:

<type 'int'>

However, the following string to int will fail:

x='123456.334'
y=int(x)

Sample outputs:

ValueError                                Traceback (most recent call last)

/home/vivek/ in ()

ValueError: invalid literal for int() with base 10: '123456.334'

Try the following solution:

x='123456.334'
y=int(float(x))
type(x)
type(y)
print y
a='12.5'
b='13.5'
print( int(float(a))+ int(float(b)) )

Finally, you can also use floating point class for decimal arithmetic:

x='123.34'
import decimal
i=int(Decimal(x))
print(i)
type(i)

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

10 comment

  1. Hey, I get an error output when I input i=int(Decimal(x)), NameError: name ‘Decimal’ is not defined. Forgive me, I’m new to Python. Can you explain this?

  2. Hi, try to write your Decimal like this (decimal):

    x='123.34'
import decimal
i=int(decimal(x))
print(i)
type(i)

  4. Bonjour
    J’ai un problème avec mon programme , puis-je vous le montrer afin que vous m’aidiez ?
    dans mon programme j’aimerai convertir un format str en int afin de faire une série de calcule

  5. Hi!
    im a python-beginner and dont know much about programming yet..
    so i ve got the “programming in python3” book
    my question:
    page55
    i ve got problems to understand int(s , base)

    it would be nice to get a simple example!
    thnx:)!

  6. import array
i=0
verts = list(xrange(1000))
f = open("gluon.txt", "r+")
words = f.read().split()
for w in words:
    verts[i]=int('w')
    i += 1

    Im getting the error:

    Traceback (most recent call last):
  File "C:\Anil\Python\test.py", line 7, in 
    verts[i]=int('w')
ValueError: invalid literal for int() with base 10: 'w'

    Please help me

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