Am 21.03.2015 um 20:05 schrieb Aaron Meurer:
https://github.com/sympy/sympy/pull/9181
I see, S(0) is not necessary after all.
I stand corrected, but how does this work?
It is doing
0 <= x + 3
which evaluates to
> 0 <= Add(Symbol: x, Integer: 3)
and then calls the __le__ of Add.
However, in the Python docs, it says
> a <= b is equivalent to a.__le__(b)
so I'd have expected it to go into
0.__le__(Add(...))
and try a numeric comparison.
Does SymPy install its own __le__ on int? (Technically possible but I'd
be shocked.)
Is Python's int.__le__ checking the other operator's type and calling
into it? (If yes, is there a reference to that behaviour, or is it a
CPython implementation detail?)
I'm confused...
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