Python3: UTF-8 encoded string conversion Chinese, Unicode encoding

There is no decode() method for ordinary ASCII encoded strings in Python3, and decode() methods for UTF-8 encoded strings.
Examples are as follows

普通字符串没有decode()方法
ch='\xe5\xa5\xbd' 
print(ch)
结果：好   （按ASCII字符打印）

UTF-8编码表示方式：a=b'\xe5\xa5\xbd' （注意字符串前的b必须有，否则会认为ASCII编码）
UTF-8编码----->中文
a=b'\xe5\xa5\xbd\xe5\xa5\xbd\xe5\xad\xa6\xe4\xb9\xa0'.decode("utf-8")
print(a)
结果：好好学习

中文打印Unicode编码
c=b'\xe5\xa5\xbd\xe5\xa5\xbd\xe5\xad\xa6\xe4\xb9\xa0'.decode("utf-8").encode("unicode_escape")
print(c)
结果：b'\\u597d\\u597d\\u5b66\\u4e60'

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