How to Correctly Declare Python Source Code Encoding?

Correctly Declaring Python Source Code Encoding

PEP 263 outlines the standard practice for declaring Python source code encoding. While the typical convention involves using "# -- coding: --", it's not uncommon to encounter variations that use "# -- encoding: --".

So, what's the correct form for encoding declaration?

According to Python documentation, a comment that matches the following regular expression in the first or second line of the Python script is processed as an encoding declaration:

coding[=:]\s*([-\w.]+)

Recommended Forms:

Two recommended forms are provided:

• # -*- coding: -*-
• # vim:fileencoding=

The former is recognized by GNU Emacs, while the latter is specific to Vim.

Compatibility Considerations:

For maximum compatibility, it's best to stick to the "coding" prefix without any additional text. However, it's important to note that specific editing software may require or accept different formats.

For example, GNU Emacs recognizes the coding form out of the box, but Vim does not. Therefore, it's essential to use a form that is compatible with both Python and your chosen editing environment.

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