Missing 1 required positional argument in python code

[edwinostby]

Hey, I have an assignment due this week. The given task is to solve a differential equation by using Euler's method, the task is;

Solve the differential equation, f'(t) = 4 + 3 * f(t), with t ∈ [0,2], by using Euler's method. Thereafter plot the solution. Use f(0) = 0 as initial condition. Use 10 000 steps.

This is the code that ive come up with so far, but i cant find a solution to the error given. Currently on windows 10, 64-bit using python 3.8.5.

import numpy as np
from matplotlib import pyplot as plt

def derived_f(t, ft):
    return(4 + 3 * f(t))

t0 = 0        
f0 = 0         
t_end = 2     

N = 10000      
h = (t_end - t0) / (N - 1)           

t = np.linspace(t0, t_end, N)
f = np.zeros(N)
f[0] = f0

for i in range(N - 1):
    f[i + 1] = f[i] + derived_f(t[i]) * h
    
plt.plot(t, f)
plt.title("Title")
plt.xlabel("xlabel")
plt.ylabel("ylabel")

Error:
TypeError: derived_f() missing 1 required positional argument: 'ft'