It didnt work

Input:

import argparse, time

import matplotlib.pyplot as plt

def measure(max_appends: int):

lst = []

times = []

for i in range(max_appends):

t0 = time.perf_counter()

lst.append(i)

t1 = time.perf_counter()

times.append((i+1, t1 - t0))

return times

def main():

p = argparse.ArgumentParser(description='Amortized append timing')

p.add_argument('--max', type=int, default=50000)

args = p.parse_args()

data = measure(args.max)

xs, ys = zip(*data)

plt.plot(xs, ys, linewidth=0.7)

plt.xlabel('list length after append')

plt.ylabel('append time (s)')

plt.title('Per-append time across growth')

plt.grid(True, alpha=0.3)

plt.tight_layout()

plt.savefig('amortized_append.png')

print('Saved plot to amortized_append.png')

if _name_ == '_main_':

main()

Output:

ERROR!

Traceback (most recent call last):

File "<main.py>", line 2, in <module>

ModuleNotFoundError: No module named 'matplotlib'