Symbols are cached by name and assumptions, and like everything else in
SymPy, are immutable. Thus:
In [1]: a = symbols('a')
In [2]: a2 = symbols('a', positive=True)
In [3]: a is a2
Out[3]: False
In [4]: hash(a) == hash(a2)
Out[4]: False
So no, you should have no problems with assumptions.
On Thu, Apr 2, 2015 at 11:54 AM, Joachim Durchholz <j...@durchholz.org> wrote:
> Am 02.04.2015 um 18:46 schrieb James Crist:
>
>>
>>
>>> Performance:
>>> Using symbols() in all contexts might have performance ramifications,
>>> creating new Symbol() objects means more memory pressure than reusing
>>> precreated symbols from sympy.abc (which happen 521 times in SymPy
>>> itself, hopefully just in test code).
>>>
>>>
>> We cache symbol creation, so Symbol('a') is Symbol('a') is True. This
>> means
>> no additional memory is consumed.
>>
>
> Ah, I wasn't aware of that.
> What happens with assumptions - do these persist? (I'm a bit worried about
> tests here.)
>
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