struct.unpack raise ValueError on Windows 10 64Bit,env Python2.7

[jcanchen]

Details:
Traceback (most recent call last):
File "C:\Python27\lib\runpy.py", line 162, in run_module_as_main
"main", fname, loader, pkg_name)
File "C:\Python27\lib\runpy.py", line 72, in run_code
exec code in run_globals
File ".\adb.zip_main.py", line 211, in
File ".\adb.zip_main.py", line 207, in main
File ".\adb.zip\adb\common_cli.py", line 151, in StartCli
File ".\adb.zip\adb\adb_commands.py", line 137, in ConnectDevice
File ".\adb.zip\adb\adb_commands.py", line 168, in _Connect
File ".\adb.zip\adb\adb_protocol.py", line 310, in Connect
File ".\adb.zip\adb\adb_protocol.py", line 244, in Read
File ".\adb.zip\adb\adb_protocol.py", line 228, in Unpack
ValueError: ('Unable to unpack ADB command.', '<6I', bytearray(b'CNXN\x00\x00\x00\x01\x00\x10\x00\x00W\x00\x00\x00L\x1d\x00\x00\xbc\xb1\xa7\xb1'), error('unpack requires a string argument of length 24',))

Command "python adb.zip shell" works fine on Ubuntu14.04 + Python2.7.
But ,I am trying to build an application on Windows with python 2.7,and it raise ValueError
Got very confused with this error, and I am new to python.
One line Added on line 243 in file adb_protocol.py "smg = str(msg)", then it seems work fine on Windows???