Python scipy module derivate not working with input from user

Question

When I tried to calculate a derivate from an user it gave me an error, that says that derivate does not take string inputs, but so how Ican achieve this

import scipy.misc import derivate

fx=input()
print(derivative(fx,1.0,dx=1e-8))

Answer 1

The first parameter is func , not str docs . If you want it as input you can use lambda and eval . The input need to be in x**3 + x**2 format

fx = input()
f = lambda x: eval(fx)

print(derivative(f, 1.0, dx=1e-8))

Answer 2

Use below code

from scipy.misc import derivative

def f(x):
   return x**2 + x
print(derivative(f,1.0,dx=1e-6))

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Explanation: - With your code you have tried to pass a string to the function derivative which expects a function instead , here is the doc