#python 3.x

#http://stackoverflow.com/questions/3531723/unpack-from-hex-to-double-in-python

# value = 0.004732..... or "0x3F70624DDC71C71D"

value = ['\x1d', '\xc7', '\x71', '\xdc', '\x4d', '\x62', '\x73', '\x3f']

bytes = list( map(ord,reversed(value)) )

sign = (1,-1)[bytes[0]>>7]

exp = ((0x7f&bytes[0])<<4) + (bytes[1]>>4) - 1023

mantissa = functools.reduce(lambda x,y: (x<<8) + y, bytes[2:], bytes[1]&0xf)

print ( sign*2**exp*(1+mantissa*2**-52) )