How can I use Python REPL in Sublime Test 4?

[MJ_PYTH]

I found keymap code from website to use REPL.
However, it doesn’t work.

Please help me how I have to change my keymap to use REPL.

Symtoms)

Whatever code I write and execute, it is only shown “Python
Repl Closed”. It doesn’t show my code result.

Keymap I used)

[
    {
        "keys"     : ["f5"],
        "command"  : "repl_python_run",
        "caption"  : "Python - RUN current file",
        "mnemonic" : "R",
        "args"     : {
            "type"        : "subprocess",
            "encoding"    : "utf8",
            "cmd"         : ["python3", "-u", "$file_basename"],
            "cwd"         : "$file_path",
            "syntax"      : "Packages/Python/Python.tmLanguage",
            "external_id" : "python",
            "extend_env"  : {"PYTHONIOENCODING" : "utf-8"}
        }
    }
]