converting float to binary 16

import struct
#################### bin32 ################################
# import bitstring
# f1 = bitstring.BitArray(float=0.456789, length=32)
# # f1 = bitstring.BitArray(float=0.456789, length=16)
# print(f1.bin)
# print("0011011101001111")
#################### bin32 ################################

def convertFloatToBin16(x):
    k = struct.pack('>e', x)
    z = ''.join(format(i, '08b') for i in k)
    return str(z)

print(convertFloatToBin16(0.9945678))