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st_atim, st_ctim and st_mtim attributes could be instances of a class (implemented in posixmodule.c) similar to:
class timespec(tuple):
 def __init__(self, arg):
 if not isinstance(arg, tuple):
 raise TypeError
 if len(arg) != 2:
 raise TypeError
 if not isinstance(arg[0], int):
 raise TypeError
 if not isinstance(arg[1], int):
 raise TypeError
 self.sec = arg[0]
 self.nsec = arg[1]
 tuple.__init__(self)
 def __add__(self, other):
 if not isinstance(other, timespec):
 raise TypeError
 ns_sum = (self.sec * 10 ** 9 + self.nsec) + (other.sec * 10 ** 9 + other.nsec)
 return timespec(divmod(ns_sum, 10 ** 9))
 def __sub__(self, other):
 if not isinstance(other, timespec):
 raise TypeError
 ns_diff = (self.sec * 10 ** 9 + self.nsec) - (other.sec * 10 ** 9 + other.nsec)
 return timespec(divmod(ns_diff, 10 ** 9))