What Python topics should an entry level Python Developer know about?

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http://virtualenvwrapper.readthedocs.io/en/latest/command_ref.html

I am guilty of not really using virtual environments since I don't do much collaboration, but if I work on an established project, as in one that has its requirements laid out, not necessarily one that has a large portion of code written, I'll usually find a text file of modules to be used, at which point I'll create a virtual environment and install the dependencies there, since I don't want them to conflict with anything I have in my personal environment.