a=0100; print a ; 64 how to reverse this?

[Bruno Desthuilliers]

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 
point
  |  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
4
 >>>

HTH