python笔记心得

1.字典的映射 
day=10
# def get_sunday():
#     return 'Sunday'
# def get_monday():
#     return 'monday'
# def get_tuesday():
#     return 'Tuesday'
# def get_defult():
#     return "Unkown"
# switcher={
#     0:get_sunday,
#     1:get_monday,
#     2:get_tuesday
# }
# day_name=switcher.get(day,get_defult)()
# print(day_name)

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2.列表推导式和字典推导式  数字循环是一个gentenerm
students={
    '喜小乐':18,
    '石敢当':20,
    '横小五':15

}
b=(key for key,value in students.items())
print(b)
3.三元表达式

x=2
y=1
r= x if x>y else y
print(r)