if xdg_config_home := getenv("XDG_CONFIG_HOME"): ^ SyntaxError: invalid syntax

This error occurs because the code is written in Python and the use of the walrus operator (:=) is only supported in Python 3.8 or newer versions. If you are using an older version of Python, you will need to use a traditional if statement instead.

For example:

import os

xdg_config_home = os.getenv("XDG_CONFIG_HOME")

if xdg_config_home:
    # do something with the XDG_CONFIG_HOME environment variable
else:
    # handle the case where XDG_CONFIG_HOME is not set

This code will work in both older and newer versions of Python.