Question

So i am starting with python and was wondering how i could substitute numbers for variables into that equation into a equation (python 2.7.2) help please?

for example

def main():
   e = raw_input("input equation here")
   g = input("number to substitute") 

so you “e” would be a equation in terms of g and you could replace the g value that has a numerical value in the original equation. Sorry its kind of confusing, thank you.

Answer 1

Using sympy:

import sympy

def main():
   e = sympy.sympify(raw_input("input equation here: "))
   g = input("number to substitute for g: ")
   print 'e=',e.subs({'g':g})