Date4

高阶函数：

#Author:Brill 高阶函数
def add(a,b,f):
    return f(a)+f(b)
res = add(3,-6,abs)
print(res)

递归：

#Author:Brill
"""
def calc(n):
    print(n)
    return calc(n+1)
calc(0)
"""
def calc(n):
    print(n)
    if int(n/2) > 0:
        return calc(int(n/2))
    print("->",n)
calc(10)

局部变量：

#Author:Brill
'''
school = "Oldboy edu."
def change_name(name):
    global school
    school = "Linux"
    print("before change",name,school)
    name = "Alex li"#这个函数就是这个变量的作用域
    age = 23
    print("After change",name,school)

name = 'alex'
change_name(name)
print(name)
print(school)
'''
school = 'Oldboy edu.'
names = ["Alex","Jack","Rain"]
def change_name():
    print(names)
    names[0]='King'
    print('Inside func',names)

change_name()
print(names)

关键字参数：

#Author:Brill
'''
#args:接受位置参数
def  test(x,*args):
    print(args)
test(1,2,3,4,5)
test(*[1,2,3,4,5,5])

#**kwargs：把N个关键字参数，转换成字典的方式
def test2(**kwargs):
    print(kwargs)
    print(kwargs['name'])
    print(kwargs['age'])
    print(kwargs['sex'])
test2(name = 'alex',age = 8,sex = 'F')
test2(**{'name':'alex','age':8,'sex':"F"})
'''

def test3(name,**kwargs):
    print(name)
    print(kwargs)
test3("alex",age =18,sex = 'F')

def test4(name,age = 18,**kwargs):
    print(name)
    print(age)
    print(kwargs)
    logger("test4")

def logger(source):
    print("from %s" % source)
test4('alex',sex = 'm',hobby = 'tesla')