The most convenient tool to install and manage Python packages is pip. Rather than installing the packages one by one, it is possible to define a list of packages that you want to install as the contents of a text file. We can pass the text file into the pip tool, which will then handle the installation of all packages in the list automatically. An added benefit to this approach is that the package list can be stored in version control.
Generally speaking, it is ideal and often sufficient to have a single requirements file that directly matches your production environment. You can change versions or add and remove dependencies on a development machine and then manage them through version control. This way, going from one set of dependencies (and associated code changes) to another can be as simple as switching branches.
In some cases, environments...
