How to differentiate with dependent variables

[Smart Manoj]

from sympy import *
var('x y')
eqn=x**2+y
print(eqn.diff(x)) # 2*x but required 2*x+y'

[Jashan]

Manoj,

you have to initialize y as a function of x rather than a Symbol

>>> var('x')

>>> y = Function('y')(x)

>>> eqn = x**2 + y

>>> diff(eqn, x)

2*x + Derivative(y(x), x)