Bug in string.find; was: Re: Proposed PEP: New style indexing, was Re: Bug in slice type

[Paul Rubin]

Steve Holden <steve at holdenweb.com> writes:
> If you want an exception from your code when 'w' isn't in the string
> you should consider using index() rather than find.

The idea is you expect w to be in the string.  If w isn't in the
string, your code has a bug, and programs with bugs should fail as
early as possible so you can locate the bugs quickly and easily.  That
is why, for example, 

  x = 'buggy'[None]

raises an exception instead of doing something stupid like returning 'g'.