Python-day12

复习：

1、python异常处理机制

try:
    a=int(input('a='))
    b=int(input('b='))
    c=a/b
    print(c)
except ZeroDivisionError:
    print('除数不能为0')
except ValueError:
    print('输入应该为整数')
finally:
    print('计算结束')

try:
    a=int(input('a='))
    b=int(input('b='))
    c=a/b
except BaseException:
    print('出错了')
else:
    print(c)

import traceback
try:
    print(1/0)
except:
    traceback.print_exc()

2、类和对象

class Student:
    native_place='山东'
    def __init__(self,name,age):
        self.name=name
        self.age =age
    def eat(self):
        print('eating')
    @staticmethod
    def method():
        print('静态方法')
    @classmethod
    def cm(cls):
        print('类方法')
print(Student.native_place)
stu1=Student('柠柠',3)
Student.eat(stu1)
stu1.eat()
Student.method()
Student.cm()

3、函数

两数相加

def ADD(a,b):
    c=a+b
    return c
res1=ADD(3,5)
print(res1)
res2=ADD(a=5,b=78)
print(res2)

对数字另赋值，列表增加

def fun(arg1,arg2):
    print('arg1',arg1)
    print('arg2', arg2)
    arg1=100
    arg2.append(10)
    print('arg1', arg1)
    print('arg2', arg2)
fun(12,[3,4,6,7,8,8])
fun(arg1=12,arg2=[3,4,6,7,8,8])

分开列表中的奇偶

def fun(num):
    odd=[]
    even=[]
    for i in num:
        if i%2:
            odd.append(i)
        else:
            even.append(i)
    return odd,even
print(fun([1,34,57,78,79,6,45]))

计算数乘

def fac(n):
    if n==0:
        return 1
    elif n==1:
        return 1
    else:
        return n*fac(n-1)
print(fac(7))

计算斐波那契数列

def fib(n):
    if n==1:
        return 1
    elif n==2:
        return 1
    else:
        return fib(n-2)+fib(n-1)
print(fib(4))

函数不同参数类型

def fun1(arg):
    print(arg)
def fun2(*arg):
    print(arg)
def fun3(**arg):
    print(arg)
list=[1,2,3]
dict1={'a':1,'b':2,'c':3}
dict2=dict(a=1,b=2,c=3)

fun1(1)

fun2(1,2,3)
fun2(*list)

fun3(a=1,b=2,c=3)
fun3(**dict1)
fun3(**dict2)