Python string to integer value

Question

I'd like to know how to convert strings in Python to their corresponding integer values, like so:

>>>print WhateverFunctionDoesThis('\x41\x42')

>>>16706

I've searched around but haven't been able to find an easy way to do this.

Thank you.

John La Rooy · Accepted Answer · 2010-10-17 20:44:49Z

7

>>> import struct
>>> struct.unpack(">h",'\x41\x42')
(16706,)
>>> struct.unpack(">h",'\x41\x42')[0]
16706

For other format chars see the documentation

answered Oct 17, 2010 at 20:44

John La Rooy

306k54 gold badges378 silver badges513 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Kane · Accepted Answer · 2010-10-17 20:51:20Z

0

If '\x41\x42' is 16-based num, like AB. You can use string to convert it.

import string

agaga = '\x41\x42'
string.atoi(agaga, 16)
>>> 171

Sorry if i got you wrong...

answered Oct 17, 2010 at 20:51

Kane

134 bronze badges

you're right, '\x41\x42' == 'AB' and in some universe Jason would ask for 0xAB result, instead of 0x4142

mykhal · Accepted Answer · 2010-10-17 20:52:33Z

0

ugly way:

>>> s = '\x41\x42'
>>> sum([ord(x)*256**(len(s)-i-1) for i,x in enumerate(s)])
16706

or

>>> sum([ord(x)*256**i for i,x in enumerate(reversed(s))])

answered Oct 17, 2010 at 20:52

mykhal

20.1k11 gold badges84 silver badges84 bronze badges

I think left shift is nicer than exponents sum([ord(x)<<(i*8) for i,x in enumerate(reversed(s))])