floating point hex to binary

#! /usr/bin/env python

def convertFloatBin(num):
    exponent=0
    shifted_num=num
    while shifted_num != int(shifted_num):
        shifted_num*=2
        exponent+=1
    if exponent==0:
        return '{0:0b}'.format(int(shifted_num))
    binary='{0:0{1}b}'.format(int(shifted_num),exponent+1)
    integer_part=binary[:-exponent]
    fractional_part=binary[-exponent:].rstrip('0')
    return '{0}.{1}'.format(integer_part, fractional_part)

def floathex_to_binary(floathex):
    num = float.fromhex(floathex)
    return floathex_to_binary(num)

print(floathex_to_binary('0x1.ccccccccccccdp+2'))

print(floathex_to_binary('0x1.ccccccccccccdp+1'))

# this doesn't work
# I want to take the float 0.9 converted to hex 0x1.ccccccccccccdp-1
# and convert it to a binary representation. I'll come back later
# when my maths have improved.