It is not recommended to pass strings to SymPy functions like this.
Support for this will eventually be removed. If you want to convert a
string to a SymPy expression, it's better to pass it to sympify()
(note the different spelling from simplify()) first, like
expr = sympify('x*sin(x)**2+x*cos(x)**2')
expand(expr)
This will raise SympifyError if there is a syntax error, as you noted.
You can also use parse_expr() if you want more low-level control over
how strings are parsed.
Aaron Meurer
On Thu, Feb 11, 2021 at 3:50 AM Michał Pawłowski
<[email protected]> wrote:
>
> Ok, I've found the solution!
>
> I need to put the formula inside of quotes. And then pass it through simplify
> or expand functions.
> The error will have such code:
> OtherError: <class 'sympy.core.sympify.SympifyError'>
>
> Thanks
> Mike
>
> czwartek, 11 lutego 2021 o 11:25:06 UTC+1 Michał Pawłowski napisał(a):
>>
>> Hi.
>>
>> I'd like to manage situation, when the formula, which I'd like to process
>> has syntax error.
>>
>> I tryied to use try except blocks, but its doesn't work, how can I achieve
>> it?
>>
>> #!/usr/bin/python3
>>
>> from sympy import *
>>
>> x = Symbol('x')
>>
>> try:
>> val_1 = x*sin(x)**2+x*cos(x)**2*
>> except SyntaxError:
>> print('SyntaxError')
>> except:
>> print('OtherError')
>>
>> Thanks
>> Mike
>
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