Sublime Text 3 Custom Python Build System

Python.sublime-build

{
    "cmd": ["python", "-u", "$file"],
    "file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
    "selector": "source.python",
    "variants": [
        {
            "name": "Terminal",
            "shell": true,
            "shell_cmd": "start cmd /k $file"
        }
    ]
}