HowTo: Python Convert a String Into Integer

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)```
• CharlieOctober 20, 2014, 8:42 pm

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?

• FaizaJanuary 25, 2016, 11:06 am

I DONT REALLY KNOW BUT I CAN FIND OUT FOR YOU AND ANYWAY THTS THE EXACT SAME THING IM STUCK ON

• FerranMay 7, 2015, 3:11 pm

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

```x='123.34'
import decimal
i=int(decimal(x))
print(i)
type(i)```
• SaikiranMay 13, 2015, 12:53 pm

x=’123.34′
import decimal
i=int(decimal.Decimal(x))
print(i)
type(i)

• de BiseMay 14, 2015, 8:24 am

Bonjour
J’ai un problÃ¨me 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 sÃ©rie de calcule

• Lisa Mc GuireNovember 8, 2015, 11:52 am

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:)!

• AnilFebruary 28, 2016, 4:37 pm
```import array
i=0
verts = list(xrange(1000))
f = open("gluon.txt", "r+")
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'
```

• taraJune 3, 2016, 12:14 pm

thanks

• SundarOctober 10, 2016, 1:18 am

Good. But how do you convert the string ‘5.3.5’ to float number?

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