username = input('username: ')
print('Welcome', username)
print('欢迎' + username)

# 如果满足条件，就执行打印语句
if 3 > 0:
    print('yes')  # 这也是注释

words = 'this is a very long sentence.' + \
        'this is a very long sentence.'
print(words)

a = 10 + 20
b = 20 + 30
