please use python to solve this question

2. Write a function called pendulum which takes input parameters L, theta0 and tf, and plots the solution (t) of the simple pendulum equation

d^2* /dt^2 + g*/ L = 0

where g is acceleration of gravity (g = 9.81 m/s^2 ), L is the length of the pendulum measured in meters, initial conditions given by theta0 (a Python list of length 2), and the plot is for t in the interval [0, tf ] (where tf is given by tf).