The easiest way is to to use the 'pip' command-line tool, which does all the work for you.

Before you can start using the NumPy library in your Python programs, you need to install it. The easiest way is to to use the "pip" command-line tool, which does all the work for you.
If you have both Python 2 and Python 3 installed on your computer, you may want to prefer using "pip3" instead.
After you've intalled NumPy once, you can use it in all your future programs.
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