How to make Sublime-Text build with Python3 in Unix

1. "Preferences"-->"Settings" open a new window, then "Tools"-->"Build system"-->"New Build System"

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2. Put this in:

{
  "cmd": ["/usr/bin/python3", "-u", "$file"],
  "file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
  "selector": "source.python"
}

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3. Save as "Python3.sublime-build" in "Packages/User/" folder.

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4. Go to "Build system", change it to "Python3".

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5. OK, everything is alright, press "Ctrl + B" running codes, have fun!

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PS:

If you don't know where Python3 is, just open Terminal, inputting "which python3" + Enter, then you'll get Python3 path if you already installed.