在 Python 中声明单字节变量

Question

How do we declare a single byte variable in Python? I would like to achieve the following result represented in C:

unsigned char = 0xFF;

I would like to know if it is possible to declare an 8-bit variable in Python.

Answer 1

Python doesn't differentiate between characters and strings the way C does, nor does it care about int bit widths. For a single byte, you basically have three choices:

1. A length 1 bytes (or bytearray ) object mychar = b'\\xff' (or mychar = bytearray(b'\\xff') )
2. An int that you don't assign values outside range(256) (or use masking to trim overflow): mychar = 0xff
3. A ctypes type, eg mychar = ctypes.c_ubyte(0xff)

The final option is largely for dealing with C functions through ctypes , it's otherwise slow/not Pythonic. Choosing between options 1 and 2 depends on what you're using it for; different use cases call for different approaches (though indexing/iterating the bytes object would get you the int values if you need to use both forms).