Checking an expression is an inequality

[Amit Saha]

Hi all,

Is this the best way to check whether an expression is an inequality ?

>>> expr = x - 4 > 0
>>> isinstance(expr, Relational)
True
>>> expr = x - 4 >= 0
>>> isinstance(expr, Relational)
True
>>> expr = x - 4 <= 0
>>> isinstance(expr, Relational)
True


Also, can I submit a change to allow "Relational" to be imported from
sympy instead of having to do:
from sympy.core.relational import Relational ?


Thanks,
Amit.


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http://echorand.me

[Aaron Meurer]

On Mon, May 11, 2015 at 12:05 AM, Amit Saha <amits...@gmail.com> wrote:
> Hi all,
>
> Is this the best way to check whether an expression is an inequality ?

Yes, except note that Relational can also be Eq().

>
>>>> expr = x - 4 > 0
>>>> isinstance(expr, Relational)
> True
>>>> expr = x - 4 >= 0
>>>> isinstance(expr, Relational)
> True
>>>> expr = x - 4 <= 0
>>>> isinstance(expr, Relational)
> True
>
>
> Also, can I submit a change to allow "Relational" to be imported from
> sympy instead of having to do:
> from sympy.core.relational import Relational ?

Are there other examples of base classes being importable directly from sympy?

Aaron Meurer

>
>
> Thanks,
> Amit.
>
>
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> http://echorand.me
>

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[Amit Saha]

On Mon, May 11, 2015 at 3:27 PM, Aaron Meurer <asme...@gmail.com> wrote:
> On Mon, May 11, 2015 at 12:05 AM, Amit Saha <amits...@gmail.com> wrote:
>> Hi all,
>>
>> Is this the best way to check whether an expression is an inequality ?
>
> Yes, except note that Relational can also be Eq().

Thanks for pointing that out.

>
>>
>>>>> expr = x - 4 > 0
>>>>> isinstance(expr, Relational)
>> True
>>>>> expr = x - 4 >= 0
>>>>> isinstance(expr, Relational)
>> True
>>>>> expr = x - 4 <= 0
>>>>> isinstance(expr, Relational)
>> True
>>
>>
>> Also, can I submit a change to allow "Relational" to be imported from
>> sympy instead of having to do:
>> from sympy.core.relational import Relational ?
>
> Are there other examples of base classes being importable directly from sympy?

I am not sure, but i understand why it isn't already.



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