简简单单学Python

函数：带名字的一个代码块，用于完成具体的工作 ，要执行函数定义的特定的任务，可调用函数

格式：def 函数名():

def namefunc(username):    ## username 是形参
	print("Your friend is "+username.title()+"")
namefunc("Mike")

Your friend is Mike        ## Mike 是实参

传递实参：

①位置实参（顺序位置不能乱）

def mypet(animal,name):
	print("\nI have a "+animal+"")
	print("My "+animal+"'s name is "+name+" .")
mypet("dog","duoduo")    ## 顺序很重要

I have a dog
My dog's name is duoduo .

②关键字实参（不关心位置顺序）

def mypet(animal,name):
	print("\nI have a "+animal+"")
	print("My "+animal+"'s name is "+name+" .")
#mypet("dog","duoduo")
mypet(animal="dog",name="duoduo")  ## 实参顺序/位置可以改变
mypet(name="duoduo",animal="dog")  ## 只要关键字能对应

I have a dog
My dog's name is duoduo .

I have a dog
My dog's name is duoduo .

默认值：（形参可以先指定默认值）

def mypet(name,animal='dog'):   ## 只能对后面的形参设默认值
	print("\nI have a "+animal+"")
	print("My "+animal+"'s name is "+name+" .")
mypet("duoduooo")               ##两种格式
mypet(name="duoduo")

I have a dog
My dog's name is duoduooo .

I have a dog
My dog's name is duoduo .

返回值；return将值返回到调用函数的代码行

def mypet(animal,anima2):
	out=("\nI have two dogs,its name are "+animal+" and "+anima2+",respectly.")
	return print(out)
mypet("duoduooo","didi")

I have two dogs,its name are duoduooo and didi,respectly.

def dogname(A,B,C):
	name=A+' '+B+' '+C
	return name.title()
dogs=dogname('duoduo','didi','haha')
print(dogs)

Duoduo Didi Haha

返回字典：

今天就在这里吧 学不进去了。。。