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Importing NumPy

Once you start a new IPython or Jupyter session, you can import the NumPy module and verify its version as follows:

In [1]: import numpy
In [2]: numpy.__version__
Out[2]: '1.11.3'

Recall that in the Jupyter Notebook you can hit Ctrl + Enter to execute a cell once you have typed the command. Alternatively, Shift + Enter executes the cell and automatically inserts or selects the cell below it. Check out all the keyboard shortcuts by clicking on Help > Keyboard Shortcut, or take a quick tour by clicking on Help > User Interface Tour.

For the pieces of the package discussed here, I would recommend using NumPy version 1.8 or later. By convention, you'll find that most people in the scientific Python world will import NumPy using np as an alias:

In [3]: import numpy as np
In [4]: np.__version__
Out[4]: '1.11.3'

Throughout this chapter, and the rest of the book, we will stick to the same convention.