The modules test.bad_coding and test.badsyntax_pep3120.py cause the
command "help('modules ftp')" to fail with the errors 

LookupError: unknown encoding: uft-8

and

SyntaxError: Non-UTF-8 code starting with '\xf6' in file (null) on line
1, but no encoding declared; see http://python.org/dev/peps/pep-0263/
for details

respectively.  Removing these modules causes the help command to run
without error.  Not that that's a solution, just evidence for their
involvement in the problem.