Python使用 - struct工具

a = struct.pack('cc', b"1", b"2")
print(type(a))
print(a)
print(type(b"1"))

a = struct.pack('bb', 1, 127) # signed char, 范围[-128, 127], 用128会抛异常
print(type(a)) # <class 'bytes'>
print(a) # b'\x01\x7f'

a = struct.pack('BB', 1, 255) # unsigned char, 范围[0, 255], 用256会抛异常
print(type(a)) # <class 'bytes'>
print(a) # b'\x01\xff'

a = struct.pack('5?', -12, -1, 0, 1, 255)
print(type(a)) # <class 'bytes'>
print(a) # b'\x01\x01\x00\x01\x01'

a = struct.pack('hh', 1, 255)
print(type(a)) # <class 'bytes'>
print(a) # b'\x01\x00\xff\x00'

a = struct.pack('ii', 1, 255)
print(type(a)) # <class 'bytes'>
print(a) # b'\x01\x00\x00\x00\xff\x00\x00\x00'

a = struct.pack('f', 1.2)
print(type(a)) # <class 'bytes'>
print(a) # b'\x9a\x99\x99?'

a = struct.pack('f', 1)
print(type(a)) # <class 'bytes'>
print(a) # b'\x00\x00\x80?'