How to check whether python is installed

How to check whether python is installed?

Under Windows system:

Run - cmd, enter the dos window, enter python, if the installation is successful, you can see the version information and enter the programming mode, as shown below (I installed it The version is python 3.5.1):

Recommended: "Python Tutorial"

Or you can use the console:

If the import reports an error, it is usually not installed. The first three are all installed successfully.

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