[ZPT] Add 'parity' to repeat?

[Shane Hathaway]

Evan Simpson wrote:
> The use of "python:test(path('repeat/thing/odd'), 'odd', 'even')" and 
> variants has become so common as to merit its own method.
> 
> I suggest that 'parity()' be added to the stock repeat object.  It would 
> return the string "odd" or "even", depending on the repetition index.
> 
> This would allow the nicely concise:
> 
>   <tr tal:attributes="class repeat/row/parity">

I forgot to mention in the first reply that I'm in favor of adding 
parity() to the stock repeat object, regardless of subpath prefixes.

Shane