Python convert strings of bytes to byte array

问题

For example given an arbitrary string. Could be chars or just random bytes:

string = '\xf0\x9f\xa4\xb1'

I want to output:

b'\xf0\x9f\xa4\xb1'

This seems so simple, but I could not find an answer anywhere. Of course just typing the b followed by the string will do. But I want to do this runtime, or from a variable containing the strings of byte.

if the given string was AAAA or some known characters I can simply do string.encode('utf-8'), but I am expecting the string of bytes to just be random. Doing that to '\xf0\x9f\xa4\xb1' ( random bytes ) produces unexpected result b'\xc3\xb0\xc2\x9f\xc2\xa4\xc2\xb1'.

There must be a simpler way to do this?

Edit:

I want to convert the string to bytes without using an encoding

回答1:

I found a working solution

import struct

def convert_string_to_bytes(string):
    bytes = b''
    for i in string:
        bytes += struct.pack("B", ord(i))
    return bytes       

string = '\xf0\x9f\xa4\xb1'

print (convert_string_to_bytes(string)))

output: b'\xf0\x9f\xa4\xb1'

来源：https://stackoverflow.com/questions/51754731/python-convert-strings-of-bytes-to-byte-array