Expressing exponents as fractions (not decimals)

[Fritz Sonnichsen]

In this simple string below, the result is a decimal. I have fooled a lot with the documentation but cannot see how to get my output as fractions instead of decimals. (In fact I thought a CAS would default to this). 

What is the simplest way to stop the 1-1/4 rendering to 1.25 (e.g. I want 5/4 here)? A global setting would be nice if one exists!

Thanks

Fritz

P=(m*w)*(m*w)**(1/4)
x = collect(P,m*w)
print("P is:    " + str(x))

P is:    (m*w)**1.25

[gu...@uwosh.edu]

Within an IPython session this can be achieved with `sympy.interactive.session.enable_automatic_int_sympification(shell)`. See the documentation: https://docs.sympy.org/latest/modules/interactive.html#module-sympy.interactive.

An alternative is to use Algebra_with_Sympy, which defaults to your desired behavior, but has a relatively simple way to turn the feature on and off.

I think these provide the behavior you looking for.

[Chris Smith]

Enter the exponent as `(S(1)/4)` or the power as `root(m*w, 4)`.

/c

On Thursday, October 26, 2023 at 9:16:53 PM UTC-5 sonn...@gmail.com wrote:

[Fritz Sonnichsen]

OK--thank you to both of you for the advice. I think Jonathan's method is inclined towards interactive use but allows global settings. Chris's method works for my inline code methods (but wish they had global variables there!). 

Much appreciated

Fritz

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[Sangyub Lee]

>  In fact I thought a CAS would default to this

> Chris's method works for my inline code methods (but wish they had global variables there!). 

Division of numeric literals is an hardcoded behavior of Python interpreter, and a hardcoded behavior of Python language itself.
So it is not possible to work around that for SymPy.
(other than modifying the IPython interpreter, or parsing strings like sympy_parser)