การใช้ vectorization ใน pandas

# Calculate the mean rank in each hand
row_start_time = time.time()
mean_r = poker_hands[['R1', 'R2', 'R3', 'R4', 'R5']].____(axis=____)
print("Time using pandas vectorization for rows: {} sec".format(time.time() - row_start_time))
print(mean_r.head())

# Calculate the mean rank of each of the 5 card in all hands
col_start_time = time.time()
mean_c = poker_hands[['R1', 'R2', 'R3', ____, ____]].____(____=____)
print("Time using pandas vectorization for columns: {} sec".format(time.time() - col_start_time))
print(mean_c.head())