Python appears non-ascii character ' \xe7 ' in the file ex6.py on line 1, but no encoding declare error

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Today, when learning Python programming, this error message appears as follows:

/users/mac/python/mac/bin/python/users/mac/desktop/3333/3333.py
File "/users/mac/desktop/3333/3333.py", line 8
Syntaxerror:non-ascii character ' \xe4 ' in file/users/mac/desktop/3333/3333.py to line 8, but no encoding declared; See http://www.python.org/peps/pep-0263.html for details
Process finished with exit code 1

At that time, there were three solutions found on the website:

First, add the following comment code at the head of the file:

# coding=<encoding Name> For example, you can add # Coding=utf-8

Second, add the following two lines of comment code at the head of the file:

#!/usr/bin/python

#-*-Coding: <encoding name>-*-For example, you can add #-*-Coding:utf-8-*-

Third, add the following two lines of comment code at the head of the file:

#!/usr/bin/python

# Vim:set fileencoding=<encoding name>: For example, you can add # Vim:set Fileencoding=utf-8:

Python appears non-ascii character ' \xe7 ' in the file ex6.py on line 1, but no encoding declare error