I have already showed you how to convert a decimal number into binary using Bitwise operations at my post http://icfun.blogspot.com/2009/04/algorithm-bitwise-operation-to-convert.html
Lets implement the above algorithm using Python scripting. I have made a small python script that will take a 32 bit positive integer number, and it will print the binary representation of that decimal number into screen. Here is the Python function.
## takes a positive number less than 2^31-1
## prints it's binary format
## constant = 10000000000000000000000000000000
const = 0x80000000
output = ""
## for each bit
for i in range(1,33):
## if the bit is set, print 1
if( int & const ):
output = output + "1"
output = output + "0"
## shift the constant using right shift
const = const >> 1
To use the function
The output will be : 11111111111111111111111111100110
At the function, I have just checked the value of each bit using Bitwise AND operator, and also switch from each bit using Bitwise Shift operator. You can change the bit number from 32 bit from 16, 8, or into 4 according to your need.