all(), get(), create(), count(). More info?

Running this tut: https://docs.djangoproject.com/en/1.1/intro/tutorial01/

Here is a list of shell commands I'm asked to issue, but I don't
understand where the commands are coming from? Are these Django or
Python commands? I've attempted to query help and read the docs but
can't find them anywhere.

Poll.objects.all()
Poll.objects.filter()
Poll.objects.get()
p.choice_set.all()
p.choice_set.create()
p.choice_set.count()

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