[Solved] ‘float’ object has no attribute ‘__getitem__’ Python error

When I run the code

import numpy as np
from scipy.integrate import odeint
import matplotlib.pyplot as plt

# Initial conditions

def f_func(eta,y_in):
    y_out = np.zeros(3)
    y_out[0] = y_in[1]
    y_out[1] = y_in[2]
    y_out[2] = -y_in[0]*y_in[2]/2
    return y_out

eta = np.linspace(0,8,100)
X0 = [0,0,0.33206]
X = odeint(f_func,X0,eta)

I get the error

 'float' object has no attribute '__getitem__'

When I run the following MATLAB program, everything works OK. The MATLAB function ode45 is equivalent to Pythons’ odeint.

main program:

clear

global beta
beta = 1;

initial_value = [0,0,1.2322];
eta = linspace(0,4,100)
[x_out, y_out] = ode45(@falkner_skan,eta,initial_value);

plot(x_out,y_out(:,2))

falkner_skan function:

function y_out = falkner_skan(x,y_in)

global beta

y_out(1,1) = y_in(2);
y_out(2,1) = y_in(3);
y_out(3,1) = -y_in(1)*y_in(3) - beta*(1-y_in(2)^2);

end

This and this and this thread does not seem to give me any guidance.