Very unusual fractions in Sympy, how do I solve this?

Question

I get very weird fractions in sympy.

I have no clue why it is given me these unusual fractions

Try to be less lazy: CTRL+C and CTRL+V the code. Thank you very much — Davide_sd, Jul 03 '22 at 07:58

score 2 · Accepted Answer · answered Jul 03 '22 at 08:01

2

To answer your question:

Rational("0.1")
# out: 1 / 10
Rational(0.1)
# out: 3602879701896397/36028797018963968

The second output happens because 0.1 is a number of type float, hence it is inherently inaccurate.

answered Jul 03 '22 at 08:01

Davide_sd

1

What about `nsimplify(0.1)`? [docs](https://docs.sympy.org/latest/modules/simplify/simplify.html#nsimplify) e.g. `nsimplify(sin(pi*0.1))` would be`-1/4 + sqrt(5)/4` – JohanC Jul 03 '22 at 13:57

score 1 · Answer 2 · answered Jul 03 '22 at 08:03

in short:

you type Rational(0.1), then sympy has to test a float.

but Rational("0.1") works. str keep the number.

if you don't like this.

First convert it to sympy's type Integer(1)/10. Also works.

2 Answers2