[Baypiggies] Html encoding question

[Ken Seehart]

Is there a handy function somewhere that converts a string so that the 
result will display as plain text in an html document?  Somewhat 
analogous to urlencode but not exactly.

So for example

 >>> html_str_encode('where x < z*5, and x > z+2')
'where x &lt; z*5, and x &gt; z+2'

I'm pretty sure I've seen this before, but I just can't seem to find it 
today.  Maybe I just need more coffee.

Thanks,
- Ken