[Csv] Proposal: comment character for csv files...

[Skip Montanaro]

Iain Haslam submitted a patch for the _csv module to implement comment
characters for CSV files:

    http://python.org/sf/1225769

Basically, you could define a comment character, which, if it appeared in
column 1, would cause the reader to skip that line.

I'm mildly against the idea (first impression mostly), but the patch isn't
very big.  Would someone else please take a look at it and comment on the
idea?

Thanks,

Skip