“write head in .py script,”
In general, Python scripts can begin with a shebang line that specifies the interpreter to be used to run the script. For example, if you want to use Python 3, you can add the following shebang line to the top of your Python script:

#!/usr/bin/env python3

This tells the system to use the env program to search for the python3 interpreter in the system’s PATH, and use it to run the script.

To set the encoding of a Python script to UTF-8

To set the encoding of a Python script to UTF-8, you can include a comment at the beginning of the file that specifies the encoding.

Here’s an example header that indicates that the source code is written in UTF-8:

#!/usr/bin/env python
# -*- coding: utf-8 -*-

This should be added to the top of the Python file, before any code is written. The coding comment specifies that the source code is encoded in UTF-8. The env shebang line specifies the Python interpreter to be used to run the script.

Note that including the encoding comment is not always necessary for a Python script, especially if the script only uses ASCII characters. However, it is a good practice to include this comment to ensure that the script is interpreted correctly, especially if it includes non-ASCII characters.

在Python的脚本中，你可以使用三个单引号(‘’‘)或者三个双引号(“”“)来包裹多行注释。你可以在文件头部使用这种方式来写多行注释。

下面是一个例子：

!/usr/bin/env python

-- coding: utf-8 --

’‘’
This is a multi-line comment that can be used
to provide descriptive information about the script.

Author: John Doe
Created: 2023-03-28
‘’‘

remainder of the script goes here

在这个例子中，使用了三个单引号来包裹多行注释。注意，这些注释不会被执行，只会被解释器忽略。可以在多行注释中包含任意数量的行和任何类型的文本，如作者、创建日期、用途等信息