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Installing Python Packages
One of the nice things about Python is, as they say, "everything is included". Which means that there are a ton of open source projects out there, that have been written to do just about everything you want done with Python. These add-on libraries (also called open source "projects" or "modules" or "packages") don't come with Python by default, but they must be added.
The way you install these libraries is using "pip", which stands for "Pip Installs Packages", which is recursive, self-referential, etc., but you get the idea. You also get the idea that the things it installs are technically "packages", although in common language people loosely refer to them as "libraries" (as they are called in other languages).
In general you will be using pip to install packages, as needed. You do this using the pip command. Since we are using Python version 3, everything tends to have a "3" suffix, e.g. we run Python with the python3, and similarly, we run pip using the pip3 command.
For example, one of the early lessons uses a package called "tabulate". The way to install this, in Linux, from a terminal window:
$ pip3 install tabulate
Sometimes, packages we install require superuser privileges, since they modify some code that requires that level of access. In these situations, for Linux, we use the 'sudo' command:
$ sudo pip3 install tabulate
Depending on your OS, this may be different. With software, google will be your best friend - if you google what you are looking for, quite often it will take you to pages that explain how to do exactly what you are looking for.
I have observed on one occasion that PyCharm did not pick up a package that I had installed in this way. However, PyCharm has its own mechanism for performing package installations. For example, in week-04, the package 'tabulate' is used. In my case, I needed to add this manually to PyCharm. The good news is that this is very easy - just click on the red squiggly 'error' line underneath the 'import tabulate' statement, and ask PyCharm to install it for you.