Thank you all;) Zohreh Karimzadeh *https://www.researchgate.net/profile/Zohreh-Karimzadeh* <https://www.researchgate.net/profile/Zohreh-Karimzadeh> Skype Name 49a52224a8b6b38b Twitter Account @zohrehkarimzad1 z.karimza...@gmail.com +989102116325 ((((((((((((((((Value Water)))))))))))))))
On Sun, Aug 14, 2022 at 5:55 AM Jeremy Monat <jemo...@gmail.com> wrote: > While outside the scope of your question, it seems like you're doing > chemistry and that's my background so I can't help but mention that ChemPy > <https://github.com/bjodah/chempy>, which is based on SymPy, can parse > chemical formulas into substances and then return properties such as mass > (molecular weight): > > >>> from chempy import Substance > >>> for chemical in ['Na','Cl','NaCl']: > substance = Substance.from_formula(chemical) > mass = substance.mass > print(mass) > 22.98976928 > 35.45 > 58.43976928000001 > > Jeremy Monat > > P.S. I actually used that ChemPy functionality, along with SymPy, to > develop a cheminformatics app <http://sampler-flask.herokuapp.com/>. > > On Sat, Aug 13, 2022 at 7:36 PM Aaron Meurer <asmeu...@gmail.com> wrote: > >> >> >> On Sat, Aug 13, 2022 at 6:06 AM Zohreh Karimzadeh <z.karimza...@gmail.com> >> wrote: >> >>> Dear sympy >>> Thank millions for sharing and caring! >>> I need to create and use symbols in dynamic way. Infact symbols are made >>> based on user input and used in code so I must use f'strings to make them. >>> As shown below: >>> L=[ 'xCl', 'xNa'] >>> for j in range(len(L)): >>> locals()[L[j]] = sympy.symbols(L[j]) >>> ss = xCl * xNaCl >>> i = 'Na' >>> j='Cl' >>> gg =f"x{i}"* f"x{j}" >>> print('gg', gg) >>> But I got the following error >>> TypeError: can't multiply sequence by non-int of type 'Symbol' >>> Could possibly let me know how can do it?? >>> >> >> You are trying to multiply the strings but you really want to multiply >> symbols. Something like Symbol(f"x{i}")*Symbol(f"x{i}"). >> >> There should be no need to inject symbols into locals to do what you are >> trying to do. Symbols do not have to be assigned to a variable to work. >> >> Aaron Meurer >> >> -- >>> You received this message because you are subscribed to the Google >>> Groups "sympy" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to sympy+unsubscr...@googlegroups.com. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/sympy/6e80be54-2134-460f-9125-08f0d99def73n%40googlegroups.com >>> <https://groups.google.com/d/msgid/sympy/6e80be54-2134-460f-9125-08f0d99def73n%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "sympy" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to sympy+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/sympy/CAKgW%3D6Lbbaid_unUZMHyO2MAhXfNvcwQdQW9sv4gjuZ2JFAFxQ%40mail.gmail.com >> <https://groups.google.com/d/msgid/sympy/CAKgW%3D6Lbbaid_unUZMHyO2MAhXfNvcwQdQW9sv4gjuZ2JFAFxQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sympy+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/CAO00iLizTJ-%3Dy617ypjoC5O%2B%2BDTb5eswMZQNwPSv9nFimoOPng%40mail.gmail.com > <https://groups.google.com/d/msgid/sympy/CAO00iLizTJ-%3Dy617ypjoC5O%2B%2BDTb5eswMZQNwPSv9nFimoOPng%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CA%2B1XYLP4reekfXrt_FJwbi3W%3Dv7nsS3rM9uZ8B0Qn%2BGDfy-q2g%40mail.gmail.com.
