Help trying to replace values in a function

[Rochense]

The problem is that I want to make a programme which from an inicial function that I defined, makes its partial derivate and then lets me to replace the variables with numeric values in the derivated function.

This is what I have:

from math import *
from sympy import symbols, diff

v,r=symbols('v r', real=True)
i=v/r #This is my initial function

d1=diff(i, v) #the first partial derivate
print d1
d2=diff(i, r) #the second one
print d2

Now what I want to do is to define for example r=1 and v=1 and then obtain the numeric value of d1 and d2.
How can I do that?

EDIT: I use 2.7 version of python

[nilamo]

I'm assuming it'll use the dsolve() function somehow, but I don't know enough about the module (...or math) to help more than that. https://docs.sympy.org/latest/tutorial/s...-equations