What is the proper method for defining encoding in Python source code?

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To define encoding in Python source code, you need to add a line with the following format at the beginning of your .py file:

# -*- coding: encoding -*-

Replace "encoding" with the name of the character encoding your file uses, such as "utf-8" or "iso-8859-1". For example, if your file uses UTF-8 encoding, the line would be:

# -*- coding: utf-8 -*-

This line informs the Python interpreter that the file is encoded in the specified character encoding. It is important to use this line to avoid errors when reading non-ASCII characters from your file.