integer to binary 0-padded

[Olivier LEMAIRE]

Thank you to all of you !! 

so finally, I can simply write :
<code>
#!/usr/bin/env python


def int2binPadded(number, size):
    """The purpose of this function is to convert integer number to binary number
    0-padded."""
    if type(number)!=int or number < 0:
	raise ValueError, "should be a positive integer"
    if type(size)!=int:
	raise ValueError, "should be an integer"
    if number > (2**size)-1:
	raise ValueError, "number is too large"
    # convert int to bin
    
    return bin(number)[2:].zfill(size)


if __name__ == "__main__":
    import sys
    print int2binPadded(int(sys.argv[1]),int(sys.argv[2]))
</code>