Implementing-cryptography-using-python

6 Chapter 1 ■ Introduction to Cryptography and Python
Installing Pip, NumPy, and Matplotlib
Ensure you are in a command shell environment with a prompt. In the following
example installation, you will get an update to the packages that come with
your Python version.
Pip, or Pip3 in this case, is the package management system for Python; it is
used to install and manage software packages written in Python. Pip is similar
to tools like Bundle, NPM, and Composer in other programming languages.
NumPy, which stands for Numerical Python, is a Python package that is the
core library for scientific computing. It contains a powerful n-dimensional array
object, and provides tools for integrating C, C++, and many other languages.
Matplotlib is an excellent solution for scientific plotting; it has the ability to be
automated and produce a wide variety of customizable high-quality plots.
Once the shell is open, type the following commands:
~$ sudo apt-get update
~$ sudo apt install python-pip
~$ pip3 install numpy
~$ pip3 install matplotlib
~$ $ python3 -c "import numpy as np; import matplotlib.pyplot as plt; x
= np.linspace(0, 2 * np.pi); y = np.sin(x); plt.plot(x, y); plt.show()"
NOTE Depending on your environment, you may need to install python3-pip to
get Pip3 to work. On installs such as Ubuntu 16.04 on Windows, you will not be able to
install version 3 when you install python-pip.
To start the Python 3 shell, type the following:
~$ python3
You should see something similar to the following depending on the version
that is installed:
Python 3.X.X (default, date)
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
To test whether you have the additional packages installed correctly, open
your favorite Python editor. If you don’t have one, you can elect to use Nano in
a Linux environment or even Notepad in a Windows environment. Type the
following:
#!/usr/bin/env python
import numpy as np