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{
"cmd": ["/usr/local/bin/python3", "$file"], 
"selector": "source.python", 
"file_regex": "file \"(...*?)\", line ([0-9]+)",
"env": {"LANG": "en_US.UTF-8"} 
}

//In Sublime Text 3, Tools -> Build System -> New Build System
//replace the "cmd" path with your 'which python3' result in terminal