Events sequence funnel - pandas

Question

Is there any other way to do events sequence funnel ?
maybe using group by with .size() or anything more simple and readable?
df = pd.DataFrame({
'user_id' : [1,2,3,3,3,3,1,1],
'time' : ['2022-01-01 00:01:00', '2022-01-01 00:02:00', '2022-01-01 00:02:00','2022-01-01 00:03:00',
'2022-01-01 00:04:00', '2022-01-01 00:05:00', '2022-01-01 00:06:00', '2022-01-01 00:07:00'],
'action' : ['pageview', 'pageview', 'pageview', 'add_to_cart', 'checkout', 'payment', 'add_to_cart' ,'checkout'] })
users = df.pivot_table(
index='user_id',
columns='action',
values='time',
aggfunc='min')
pageview = users.eval('~pageview.isnull()')
add_to_cart = users.eval('#step_1' and 'add_to_cart > pageview')
checkout = users.eval('#step_2' and 'checkout > add_to_cart')
payment = users.eval('#step_3' and 'payment > checkout')
n_pageview = users[pageview].shape[0]
n_add_to_cart = users[add_to_cart].shape[0]
n_checkout = users[checkout].shape[0]
n_payment = users[payment].shape[0]
print(f'pageview {n_pageview}')
print(f'add_to_cart {n_add_to_cart}')
print(f'checkout {n_checkout}')
print(f'payment {n_payment}')