GUI user input to function

[Nico Vogeli]

Am Donnerstag, 28. Dezember 2017 14:00:14 UTC+1 schrieb Chris Angelico:
> On Thu, Dec 28, 2017 at 11:06 PM, Nico Vogeli <nicco.9537 at gmail.com> wrote:
> > Am Donnerstag, 28. Dezember 2017 12:59:24 UTC+1 schrieb Chris Angelico:
> >> On Thu, Dec 28, 2017 at 8:38 PM, Nico Vogeli <nicco.9537 at gmail.com> wrote:
> >> > Withs test, this return a correct value for the two x functions:
> >> >
> >> > from sympy import symbols
> >> >
> >> > x = symbols('x')
> >> > f1 = eval(input('function 1 '))
> >> > f2 = eval(input('function 2 '))
> >> >
> >>
> >> What are you typing as input? It's hard to grok your code without knowing that.
> >>
> >> ChrisA
> >
> > I'm sorry! User input would look like this for example: x**2 + 3*x or x**3
> >
> 
> Cool. That's an expression, but it isn't a function. To make that into
> a function, you need to prefix it with the lambda keyword.
> 
> So you should be able to construct functions like this:
> 
> f1 = eval("lambda x: " + input("function 1: "))
> 
> Then, when you type "x**3", Python evaluates "lambda x: x**3", which
> is a function.
> 
> ChrisA

Thank you very much! It now works perfectly fine now!!

Thank you!

Nicco