Proofreading checklist

[eah13]

Things I've encountered as one-offs that I'll Ctrl-f for in all chapters:

• [x] remove all u'unicode strings' since Python 3 is unicode by default (esp chapter 14)
• [ ] make sure all markdown links have http:// in the URL
• [ ] explain u' vs b' in Python 2 & 3 at the appropriate points. The python docs have a great explanation of urllib here:

Note that urlopen returns a bytes object. This is because there is no way for urlopen to automatically determine the encoding of the byte stream it receives from the http server. In general, a program will decode the returned bytes object to string once it determines or guesses the appropriate encoding.

• [ ] Bad hyphens and any other character problems. Just saw this bad hyphen in chapter 12:

There may be other problem characters. Once they're found it's an easy job to go replace them with the right char.

[eah13]

(Added bad hyphens to list)