如何使Python var ='\\ x'+“ FF”成为1个字节？

Question

示例代码：

hexVar = '1D' # i need this to be dynamically allocated
var1 = '\\x' + hexVar
print "var1 len: ", len(var1) # gives me 4 instead of 1

在发送给袜子udp关联请求格式时，我需要将此var1设为1个字节

Answer 1

您可以将文本转换为整数（以16为底），将下一个整数转换为char，然后使用代码b"\x1d"将char编码为单字节

hexVar = '1D'
integer = int(hexVar, 16)
char = chr(integer)
var1 = char.encode()
print("var1 len: ", len(var1), var1) #

结果

var1 len:  1 b'\x1d'

---

编辑：

import binascii

hexVar = '1D'
var1 = binascii.a2b_hex(hexVar)

print("var1 len: ", len(var1), var1)

或

import binascii

hexVar = '1D'
var1 = binascii.unhexlify(hexVar)

print("var1 len: ", len(var1), var1)