def calc(x, y):res = x**yreturn res  # 返回函数执行结果
c = calc(2, 3)  # 结果赋值给c变量
print(c)

def stu_register(name,age,country,course):print("----注册学生信息------")print("姓名:",name)print("age:",age)print("国籍:",country)print("课程:",course)stu_register("王山炮",22,"CN","python_devops")
stu_register("张叫春",21,"CN","linux")
stu_register("刘老根",25,"CN","linux")

def stu_register(name, age, course='PY' ,country='CN'):print("----注册学生信息------")print("姓名:", name)print("age:", age)print("国籍:", country)print("课程:", course)

def stu_register(name, age, *args):  # *args 会把多传入的参数变成一个元组形式print(name, age, args)stu_register("Henry", 22, "IT", "2018-05-08")输出：
Henry 22 ('IT', '2018-05-08')

def stu_register(name,age,*args,**kwargs):  # *kwargs 会把多传入的参数变成一个dict形式print(name,age,args,kwargs)stu_register("Jack",32,"CN","Python",sex="Male",province="ShanDong")输出：
Jack 32 ('CN', 'Python') {'sex': 'Male', 'province': 'ShanDong'}  # 后面这个('CN', 'Python')就是args,{'sex': 'Male', 'province': 'ShanDong'}就是kwargs

def stu_register(name, age, course='PY', country='CN'):print("----注册学生信息------")print("姓名:", name)print("age:", age)print("国籍:", country)print("课程:", course)if age > 22:return Falseelse:return Trueregistriation_status = stu_register("王山炮",22,course="PY全栈开发",country='JP')if registriation_status:print("注册成功")
else:print("too old to be a student.")

name = "Alex"def change_name(name):print("before change:", name)name = "Jack"print("after change", name)change_name(name)print("在外面看看name改了么?",name)输出：
before change: Alex
after change Jack
在外面看看name改了么? Alex

name = "Alex"def change_name():global name  # 将name改为全局变量print("before change:", name)name = "Jack"print("after change", name)change_name()
print("在外面看看name改了么?", name)输出：
before change: Alex
after change Jack
在外面看看name改了么? Jack

names = ["luara", "jason", "henry"]def change_name():names = ["luara", "jason"]print("after change:", names)
change_name()
print("outer:", names)输出：
after change: ['luara', 'jason']
outer: ['luara', 'jason', 'henry']

names = ["luara", "jason", "henry"]def change_name():del names[2]print("after change:", names)change_name()
print("outer:", names)输出：
after change: ['luara', 'jason']
outer: ['luara', 'jason']

age = 19def func1():age = 73def func2():print("func2:", age)return func2  # 返回一个函数名
val = func1()  # val获取到了func2的内存地址
print(val)
val()  # 此时相当于执行func2()

输出：
<function func1.<locals>.func2 at 0x0000000001E59AE8>  # 打印了func2的内存地址
func2: 73

def func1():print("alex")def func2():print("eric")func1()输出：
alex

def func1():print("alex")def func2():print("eric")func2()  # 调用func2
func1()  # 调用func1
输出：
alex
eric

age = 19def func1():age = 73print("func1:", age)def func2():print("func2:", age)func2()func1()输出：
73
73

age = 19def func1():def func2():print("func2:", age)age = 73func2()func1()输出：
func2: 73

def add(x, y, f):return f(x) + f(y)  # 相当于abs(4) + abs(-9)
res = add(4, -9, abs)
print(res)输出：
13

def fact(n):if n == 1:return 1  # 当n=1时结束递归return n * fact(n-1)res = fact(5)
print(res)

def calc(n, count):print("n:{},   count:{}".format(n, count))if count < 5:return calc(n/2, count+1)else:return n  # 如果count>5 就返回当前的n值
res = calc(188, 0)
print("程序结束时的n值：", res)输出：
n:188,   count:0
n:94.0,   count:1
n:47.0,   count:2
n:23.5,   count:3
n:11.75,   count:4
n:5.875,   count:5
程序结束时的n值： 5.875

# 使用二分法查找列表中的某个数据
li = [2, 3, 6, 44, 34, 78, 67, 77, 90, 345, 67, 39, 100, 104, 209, 56, 789, 290, 62]def find(li1, num):print(li1)n = int(len(li1)/2)  # 列表长度折半if n >= 1:  # 列表元素大于1if num < li1[n]:  # 数字在列表左边print("the number is in the left of the list")return find(li1[0:n], num)elif num > li1[n]:  # 数字在列表右边print("the number is in the right of the list")return find(li1[n+1:], num)elif num == li1[n]:print("find the number:", li1[n])else:if num == li1[n]:print("find the number:", li1[n])else:print("the number is not existed!")li.sort()  # 列表元素排序
print(li)
find_num = int(input("input the number you want to find:"))
find(li, find_num)