pandas的for循环，iterrows方法，遍历标题和行内容

# Import cars data

import pandas as pd

cars = pd.read_csv('cars.csv', index_col = 0)

# Code for loop that adds COUNTRY column

for lab, row in cars.iterrows():

cars.loc[lab,'COUNTRY'] = str.upper(row['country'])

# Print cars

print(cars)