python bitwise operations on C data types?

Question

Is it possible to do bitwise operations on C data types in Python?

Python 2.7.1+ (r271:86832, Apr 11 2011, 18:13:53) 
[GCC 4.5.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from ctypes import c_uint8
>>> foo = c_uint8(4)
>>> foo << 1
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for <<: 'c_ubyte' and 'int'
>>>

perhaps try int(foo) << 1. Or cast 1 into a `c_ubyte

inspectorG4dget
– inspectorG4dget

2011-08-18 18:55:24 +00:00
Commented Aug 18, 2011 at 18:55 — inspectorG4dget
– inspectorG4dget, Commented Aug 18, 2011 at 18:55

michel-lind · Accepted Answer · 2011-08-18 19:02:22Z

4

Try foo.value << 1

or to update foo,

foo.value <<= 1

answered Aug 18, 2011 at 19:02

michel-lind

9,8463 gold badges35 silver badges32 bronze badges

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

Comments

Roberto Bonvallet · Accepted Answer · 2011-08-18 19:01:19Z

4

This works, but it isn't done at the C level:

foo.value << 1

answered Aug 18, 2011 at 19:01

Roberto Bonvallet

33.7k5 gold badges45 silver badges57 bronze badges

Comments

agf · Accepted Answer · 2011-08-18 19:02:51Z

2

from ctypes import c_uint8
foo = c_uint8(4)
print foo.value << 1

will print 8 as you want. To change foo, use

foo.value <<= 1

answered Aug 18, 2011 at 19:02

agf

178k45 gold badges300 silver badges241 bronze badges

Collectives™ on Stack Overflow

python bitwise operations on C data types?

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related