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    <p>I replaced this </p> <pre><code> self.to_min() == other.to_min() </code></pre> <p>with this </p> <pre><code> self.__hash__() == other.__hash__() </code></pre> <p>And also edited the <strong>eq</strong> to return boollean, rather than integer Now it works, I still wonders. Anyway, this is full code if anyone is interested:</p> <pre><code>class Time(object): ''' classdocs ''' def __init__(self, h, m): if isinstance(h, int) and isinstance(h, int): self.m = m self.h = h if(self.m &gt;= 60): self.h += self.m // 60 self.m %= 60 def __add__(self, m): return Time(self.h, self.m + m) def to_min(self): return self.h * 60 + self.m def __cmp__(self, other): print "__cmp__" if isinstance(other, Time): if self.to_min() &gt; other.to_min(): return 1 else: if self.__hash__() == other.__hash__(): return 0 else: return -1 def __eq__(self, other): print "__eq__" if isinstance(other, Time): if self.to_min() == other.to_min(): return True else: return False def __gt__(self, other): return self.to_min() &gt; other.to_min() def __ge__(self, other): return self.to_min() &gt;= other.to_min() def __lt__(self, other): return self.to_min() &lt; other.to_min() def __le__(self, other): return self.to_min() &lt;= other.to_min() def __str__ (self): return str(self.h) + ":" + str(self.m) def __hash__(self): print "__hash__" return self.to_min() # return 1 def __ne__(self, other): print "__ne__" return not self == other # a = set([Time(10,10), Time(10,20)]) # b = set([Time(10,10)]) # print a in set([b]) a = {Time(10,10)} print {Time(10,10)}.issubset(a) # print b.issubset( a) # for i in a: # print i in a </code></pre>
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