Sublime text3 build system for python3

/*
Build System -> New Build System
*/
{
    "cmd": ["python3", "-i", "-u", "$file"],
    "file_regex": "^[ ]File \"(...?)\", line ([0-9]*)",
    "selector": "source.python"
}
/*
save and exits python3.sublime-build

now inside build system you can found " python3 "
*/

/*
create some demo file extension .py
demo.py
*/
import sys
print(sys.version)
/*
now press command + b
*/