added a comma
clarified meaning of "discrete" with "independent"
added italics
clarified description of doc-string
made reference to example more explicit
switched "this" to "the"
moved italics
simple past tense to past perfect progressive
added an "also"
switched italics to in-line code
reworded sentence on symbol characters
changed "we have" to "there are"
removed spacing around em dashes
change period to colon
switched "to know to use" to "when using"
switched "ones" to "functions"
minor rewording of sections on comparison functions
switched period to colon
switched "some of them were" to "including"
added in-line syntax formatting