python入门

from keyword import kwlist

print(kwlist)

# 分支结构关键词： if 、else、elif
# 单分支结构：if 、else
# 案列：账号密码登录
# username = input('输入用户名')
# password = input('请输入密码')
# if username == 'admin' and password == '123456':
#     print('登录成功')
# else:
#     print('登录失败')

if year % 4 == 0 and year % 100 != 0:
    print(f'{year}是闰年')
elif year % 400 == 0:
    print(f'{year}是闰年')
else:
    print(f'{year}是平年')