a=0100; print a ; 64 how to reverse this?
kar1107 at gmail.com
Tue Jul 17 22:43:38 CEST 2007
On Jul 17, 5:35 am, Bruno Desthuilliers <bruno.
42.desthuilli... at wtf.websiteburo.oops.com> wrote:
> mosi a écrit :
> > Problem:
> > how to get binary from integer and vice versa?
> > The simplest way I know is:
> > a = 0100
> > a
> > 64
> > but:
> > a = 100 (I want binary number)
> > does not work that way.
> > a.__hex__ exists
> > a.__oct__ exists
> > but where is a.__bin__ ???
> > What`s the simplest way to do this?
> bruno at bruno:~$ python
> Python 2.5.1 (r251:54863, May 2 2007, 16:56:35)
> [GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> help(int)
> Help on class int in module __builtin__:
> class int(object)
> | int(x[, base]) -> integer
> | Convert a string or number to an integer, if possible. A floating
> | argument will be truncated towards zero (this does not include a string
> | representation of a floating point number!) When converting a
> string, use
> | the optional base. It is an error to supply a base when converting a
> | non-string. If the argument is outside the integer range a long object
> | will be returned instead.
> >>> a = int('100', 2)
> >>> a
While it's interesting to know we can go from binary to int, the OP
wanted the other way.
I think it will be a nice enhancement to add to % operator (like %x,
something for binary, %b or %t say) or something like a.__bin__ as
suggested by the OP.
FWIW, gdb has a /t format to print in binary.
(gdb) p 100
$28 = 100
(gdb) p /x 100
$29 = 0x64
(gdb) p /t 100
$30 = 1100100
More information about the Python-list