Ram Rachum added the comment:

> There are some properties of set comparison:
> 
> (a < b) == (a <= b and a != b)

I don't think so, because counter equality is based on dict equality so it 
doesn't ignore zero values.

> (a <= b) == (a < b or a == b)

No, ditto.

> (a <= b and b <= a) == (a == b)

No, ditto.

> (a < b and b < a) == False

Yes.

> (a <= b) == (a - b == set())

Yes.

> if (a <= b and b <= c) then (a <= c)

Yes.

> (a <= b and a <= c) == (a <= (b & c))

Yes.

> (a <= c and b <= c) == ((a | b) <= c)

Yes.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22515>
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