Parse python error message and display in overlay

How to link Sublime Text Build system to Python 3.md

1. Go to Sublime Text to: Tools -> Build System -> New Build System and put the next lines:

{
    "shell_cmd": "/usr/bin/env python3 -u \"${file}\" 2> >(tr '\\n' '|')",
    "selector": "source.python",
    "file_regex": "[ ]*File \"(...*?)\", line ([0-9]*)(...*?)\\|...*?\\|(.*)\\|",
    "working_dir": "${file_path}"   
}

Then save it with a meaningful name like: Python3.sublime-build

2. Go to Tools -> Build system -> and check Python3

test it with (should overlay an error message of list index out of range):

import sys
print(sys.version)
[1][2]

Press: Ctrl + b