This method defines how comparison operators work when
The returned value uses the same conventions as Python's
cmp() function: it
returns a negative number if the first argument should
come first, a positive number if the second argument
should come first, and zero if they are considered equal.
To get this effect, we can simply call the
cmp() function and pass it the two
timestamps. The result of that function would order the
objects in chronological order, so we could negate that result
to get reverse chronological order. Or, as is done here,
we could just reverse the order of the arguments.
# - - - O l d I n f o . _ _ c m p _ _ - - - def __cmp__ ( self, other ): """Compare two OldInfo objects. [ other is an OldInfo object -> if self should precede other -> return a negative number else if self should follow other -> return a positive number else -> return 0 ] """ return cmp ( other.modEpoch, self.modEpoch )