我这样做的方法（通常是在发送到某些硬件之前，通常要确保固定宽度的整数）是通过ctypes
from ctypes import c_ushort
def hex16(self, data):
'''16bit int->hex converter'''
return '0x%004x' % (c_ushort(data).value)
#------------------------------------------------------------------------------
def int16(self, data):
'''16bit hex->int converter'''
return c_ushort(int(data,16)).value
否则struct可以做到
from struct import pack, unpack
pack_type = {'signed':'>h','unsigned':'>H',}
pack(self.pack_type[sign_type], data)
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