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Windows

  • Open the download Python’s official website https://www.python.org/downloads/release/python-370/ x86: said is a 32-bit x86-64 computer: is a 64 – bit computer

    Current Python versions are 2.x and 3.x. The 3.x version is recommended.

  • My Computer -> Properties -> Advanced System Settings -> Environment Variables

  • configuration

    In the “variable values” column, copy the python path you installed into it, for example, C:\Python37

  • Note that when copying path C:\Python37, use a semicolon before it, and note that the semicolon must be a semicolon in English.

  • Test open CMD can enter Python to run. If Python is not a valid command, you might want to check the steps above

Mac

Mac platforms typically ship python2. x if you want to install Python3.x. It is best to install with HomeBrew.

  • Install HomeBrew
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
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  • test
brew doctor
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  • Install Python
brew install python
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  • To view
// The system has python2.7. The directory is /usr/bin/pythonwhichPython //brew installed python3.6 in the directory /usr/local/bin/python3
which python3
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Unix/Linux

Unix/Linux generally comes with two versions. You can enter Python and Python3 on the terminal to view the versions.