# %% Import

import numpy as np
import time

# %% Initialisering

N = 100000
dyn_array = np.array([])
preallok_array = np.zeros(N)

# %% Append:

tic = time.time()

for k in range(0, N):
    dyn_array = np.append(dyn_array, 10*k)

toc = time.time()
t_elapsed_append = toc - tic

# %% Preallok:

tic = time.time()

for k in range(0, N):
    preallok_array[k] = 10*k

toc = time.time()
t_elapsed_preallok = toc - tic

# %% Sammenlikning:

forhold_append_preallok = \
    t_elapsed_append/t_elapsed_preallok

print('------------------------------------------------')
print('N =', N)
print('t_elapsed_append [s] = ',t_elapsed_append)
print('t_elapsed_preallok [s] =', t_elapsed_preallok)
print('t_elapsed_append/t_elapsed_preallok =',
      forhold_append_preallok)
print('------------------------------------------------')