How to open a Python file correctly with correct Python version?

First install Python 2.x.
Then install Python 3.x.
The first line of your Python file must consist of shebang.
Shebang for Python 2.x file is: #!/usr/bin/env python
Shebang for Python 3.x file is: #!/usr/bin/env python3
When you have done this, your Python file will be opened with correct python version automatically.

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