HowTo: Python Convert a String Into Integer

Author: Vivek Gite Last updated: August 9, 2013 10 comments

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?

Tutorial details
Difficulty	Easy (rss)
Root privileges	No
Requirements	Python
Time	1m

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:

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)

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10 comments… add one

Charlie Oct 20, 2014 @ 20:42
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?
Reply Link
- Faiza Jan 25, 2016 @ 11:06
  I DONT REALLY KNOW BUT I CAN FIND OUT FOR YOU AND ANYWAY THTS THE EXACT SAME THING IM STUCK ON
  Reply Link
Ferran May 7, 2015 @ 15:11
Hi, try to write your Decimal like this (decimal):
```
x='123.34'
import decimal
i=int(decimal(x))
print(i)
type(i)
```
Reply Link
Saikiran May 13, 2015 @ 12:53
x=’123.34′
import decimal
i=int(decimal.Decimal(x))
print(i)
type(i)
Reply Link
de Bise May 14, 2015 @ 8:24
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
Reply Link
Lisa Mc Guire Nov 8, 2015 @ 11:52
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:)!
Reply Link

Anil Feb 28, 2016 @ 16:37

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

Reply Link

tara Jun 3, 2016 @ 12:14
thanks
Reply Link
Sundar Oct 10, 2016 @ 1:18
Good. But how do you convert the string ‘5.3.5’ to float number?
Reply Link
jimbob Jan 13, 2017 @ 11:54
how can i turn a sentence that a user has input into numbers
Reply Link