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Oops... the dict part should have been "dict(lhs=first, rhs=second)":
 def failUnlessEqual(self, first, second, msg=None):
 """Fail if the two objects are unequal as determined by the '=='
 operator. Argument msg could optionally include string format
 operators named "lhs" and "rhs" (e.g., "%(lhs)r")
 """
 if not first == second:
 raise self.failureException, \
 (msg or "%(lhs)r != %(rhs)r") % dict(lhs=first, rhs=second)