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pythonmathevalequationequation-solving
Brigham Forrest Schmidt
Brigham Forrest Schmidt

Reputation: 11

Is it possible to find the value of x in python? i.e asking python to solve an equation such as 2x + 23 - 7x when x is not a pre-defined variable

What I want is a program that can determine the value of x from an equation when x is not yet defined i.e. not a python variable. Just an example below, not the real thing.

sol = eval("input please type the equation: ")
#i.e sol = 32x - 40
print(sol)

Upvotes: 1

Views: 10922

Answers (3)

p2arkLars
p2arkLars

Reputation: 1

You can just use sympy. Then you can do it in the print command. It looks like this.

import sympy 
from sympy.abc import x
print sympy.solve(nub1*x+nub2-nub3*x,"Whatever you want here.")

Upvotes: 0

Hooked
Hooked

Reputation: 88278

An explicit example using sympy

import sympy
from sympy.abc import x

print sympy.solve(32*x-40,"x")
print sympy.solve(2*x+23-7*x,"x")

Gives as output:

[5/4]
[23/5]

Note that there is the separate question of parsing user input. That is, how do we take the string "32x-40" and turn it into the expression 32*x-40. This can be a non-trivial task depending on the complexity of the equations you are looking to model. If you are insterested in that, I would look into pyparsing.

Upvotes: 1

Pranjal Mittal
Pranjal Mittal

Reputation: 11470

I am not aware of any built in way to do that but Sympy library is built exactly for this stuff. Solvers module in Sympy can be used to solve linear equations. (Here) is a link to its docs.

Upvotes: 2

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