[andreasvc]

I never understood the need for the new style of formatting, or the advantage. Fortunately % formatting is no longer getting deprecated.

[pyre]

The only downside that I've come across is when you do something like:

  "%s %s" % blah

If a bug causes `blah` to be a string (rather than a tuple or a list), it will attempt to expand the string, possibly giving a confusing error.