parse_expr with the Symbol and local_dict allows for "2x" so no need to
reply further thanks !
On Wednesday, 7 January 2026 at 14:50:58 UTC Little Grey Men wrote:
> ok so I had to switch back to simpify since of the tokenize approach with
> parse_expr too different.
> "x" also started working without a local_dict defined ?
> I think "2x" cannot be turned into an expression <- if you have an answer
> for that ?!
> The overall approach seems create the expression first and then use it's
> subs method if required.
> cheers!
>
>
> On Tuesday, 6 January 2026 at 14:52:25 UTC Little Grey Men wrote:
>
>> no problem i think what i asking like :
>> input_str="2x"
>> transformations = ... implicit_mult ...
>> expr = parse_expr (input_str, local_dict={"x":x},
>> transformations=transformations).subs("x", 4.0)
>>
>> I think above is the approx replacement i looking for.
>> cheers
>> Daniel.
>>
>>
>>
>> On Tuesday, 6 January 2026 at 14:24:39 UTC Oscar wrote:
>>
>>> On Tue, 6 Jan 2026 at 14:15, Little Grey Men <[email protected]>
>>> wrote:
>>> >
>>> > OK I am able to see working the version with parse_expr with a
>>> local_dict
>>> > the previous sympify syntax used which failed with "x" was slightly
>>> more complex in that it also used a dict(subs).
>>> >
>>> > Should i be able to call parse_expr with the local_dict to declare x
>>> AND the dict(subs) to evaluate.
>>> > In such a case if it were valid, it would make sense the evaluate flag
>>> would be set to True.
>>> >
>>> > Does any of the above make sense ?
>>>
>>> It is too imprecise to understand. Show the actual code and explain
>>> very clearly what happens when you run the code and what it is that
>>> you want to happen.
>>>
>>> --
>>> Oscar
>>>
>>
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