python筆記記錄

 

class Test:
    # 類屬性
    num = 100

    def __init__(self):
        # 實例屬性，其實就像對象中的屬性
        self.age = 20

    # def setNum(self, num):
    #     self.num = num
# Test.num=200    print(Test.num)  200
# test_3 =Test()
# test_3.setNum(200)
# print(test_3.num) #200
# print(Test.num)#100

    @classmethod        #類方法
    def setNum(self,num):
        self.num=num

test_4=Test()
test_4.setNum(200)
print(test_4.num)#200
print(Test.num)#200

 

class ShortInputException(Exception):
    '''你定義的異常類'''

    def __init__(self, length, atleast):
        Exception.__init__(self)
        self.length = length
        self.atleast = atleast


try:
    s = input('請輸入-->')
    if len(s) < 3:
        raise ShortInputException(len(s), 3)
except EOFError:
    print('/你輸入了一個結束標記eof')
except (ShortInputException,s):  # 這個變量綁定到錯誤的實例
    print('ShortInputException:輸入的長度是%d,長度至少應該是%d'%(s.length,s.atleast))
else:
    print('沒有異常')