python 笔记6

类对象与继承

class A():
    x =6
    x1=["221"]
    print("123")
    def add(self,x,y):

        return x+y
    def __init__(self,m,n):
        self.m =m
        self.n = n
    def fun(self,y):
        print(y,self.x,self.m)
class B(A):
    print("456")
    x=63
    def __init__(self,m,n,g):
        super().__init__(m,n)
        self.g=g
    def add(self,m,n,g):
        return m+n+g

a =B(9,52,6)
a.x =111
a.x1.append("3")
l =a.add(1,2,3)
t =a.x
k=a.m

print(l,t,a.m ,a.x1 is A.x1,a.x1,a.n,a.g)

返回值：

123
456
6 111 9 True ['221', '3'] 52 6

Process finished with exit code 0

 异常与捕获

def f(a):
    print(a+1)

try:
    f(b)
except TypeError:
    print("类型错误")
except NameError as e:
    print("名称错误",e)
except  Exception:
    print("未知错误")
else:
    print("正常")
finally:
 print("all pass")

返回值

名称错误 name 'b' is not defined
all pass