Don't point readers to rand, point to random!  And make it a hyperlink while you're at it.
Don't point readers to rand, point to random!  And make it a hyperlink
while you're at it.

Also, when discussing order of reading, make it clear that chapter 2
is assumed background material for the remainder of the manual.
That's needed for terminology if nothing else!

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator