Yes, this is intentional. It is really no different than this:
In [1]: a = 1
In [2]: b = 1
In [3]: type(a)
Out[3]: int
In [4]: type(b)
Out[4]: int
In [5]: a == b
Out[5]: True
In [6]: a is b
Out[6]: True
Jason
moorepants.info
+01 530-601-9791
On Wed, Jun 3, 2020 at 12:53 PM James Bateman <james.bate...@gmail.com>
wrote:
> I've just discovered a bug in my code which boiled down to the following,
> where a symbol "y" was given the same SymPy name as an existing symbol.
>
> import sympy as sp
> x = sp.Symbol('x')
> y = sp.Symbol('y')
>
> x == y # True
> x is y # True; expected False
> x + y # 2*x; expected x + x (which would have made the bug in my code more
> apparent)
>
> The behaviour here is very surprising to me. I would have expected x and
> y to be different Python objects with __repr__ methods which just so happen
> to return the same string. Instead, x and y are apparently different
> Python names for the same object (x is y).
>
> Is this intentional? I think I must misunderstand some deep design choice
> in SymPy, and I can't express my confusion well enough to Google it.
> Please help!
>
>
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