关于str 类型转bytes类型

Question

怎么才能让exp里的字符串变成 单斜杠 并且类型是 bytes

```python
htmlStr = r"\x4d\x5a\x41\x52\x55\x48\x89\xe5"

print(type(htmlStr))
exp  = str.encode(htmlStr)

print(exp)
print(type(exp))

#*********************************************************************
print('*'*100)

#bytes
HtmlBytes = b"\x4d\x5a\x41\x52\x55\x48\x89\xe5"

print(HtmlBytes)
print(type(HtmlBytes))

结果

<class 'str'>
b'\\x4d\\x5a\\x41\\x52\\x55\\x48\\x89\\xe5'
<class 'bytes'>
****************************************************************************************************
b'MZARUH\x89\xe5'
<class 'bytes'>

```