[Python知识库]python第9天

# 1
class A:
    def say_something(self):
        print("A says something")

class B:
    def print_info(self):
        print("This is B")

class C:

    def say_something(self):
        print("C says something")
    def print_info(self):
        print("This is C")

class D(B):
    pass

class E:
    pass
class G(E, C):
    pass

# A, B, E, C
class F(A, B, G):
    def say_something(self):
        super(E, self).say_something()

f = F()
f.print_info()
f.say_something()
print(F.__mro__)
# 2
def sum_outer():
    data_list = []
    def sum_inner(arg):
        data_list.append(arg)
        print(sum(data_list))
    return sum_inner

sum_func = sum_outer()
sum_func(10)
sum_func(20)
#3
import  time

def cost_time(func):
    def inner(*args, **kwargs):
        before_time = time.time()
        func(*args, **kwargs)
        after_time = time.time()
        print(after_time - before_time)
    return  inner
print(time.time())

@cost_time
def timein():
    time.sleep(2)
    print("timein")
timein()

# 4
class tody:

    def __init__(self):
        self._data = None
    @staticmethod
    def static_method(*args, **kwargs):
        print("this is staticm")
    @classmethod
    def class_method(cls):
        print("this is classm")

    @property#访问data方法，转为属性：只提供访问：xxx.peoperty
    def data(self):
        return self._data
    @data.setter#委托属性：提供修改：xxx.setter
    def data(self, value):
        self._data = value
    @data.deleter#委托属性：删除：xxx.deleter（xxx根据property决定）
    def data(self):
        del self._data
m = tody()
tody.class_method()
tody.static_method()
m.class_method()
m.static_method()

print(m.data)
m.data = "data"
print(m.data)
# del m.data
# print(m.data)

运行结果：

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