#！/user/bin/env python

# -*- coding:utf-8 -*-

# 给形参指定默认值时,等号两边不要有空格 def function_name("parameter_0",parameter_1='default value')

# 函数形参的位置很重要 传递参数使用关键字实参(一一对应的传递，可以不用理会顺序)

# 默认值传递时候要指定传递(可以对应位置传递)

# 返回值return 默认函数已经结束了

def get_formatted_name(frist_name,last_name,middle_name=''):

if middle_name:

full_name = frist_name + ' ' + middle_name + ' ' + last_name

else:

full_name = frist_name + ' ' + last_name

return full_name.title()

musician = get_formatted_name('jimi','hendrix')

print(musician)

musician = get_formatted_name('jimi','li','men')

print(musician)

# 返回字典

def build_person(frist_name, last_name):

person = {'frist': frist_name, 'last': last_name}

return person

musician = build_person('jimi','hendrix')

print(musician)

# 结合while写函数

# 向函数传递列表 for循环提取

def greet_user(names):

for name in names:

msg = 'hello ' + name.title()

print(msg)

user_names = ['hannah','ty','margot']

greet_user(user_names)

# 函数中修改列表就是调用列表方法修改

'''【遇到禁止修改源文件的列表，就要用[:]创建一个副本进行修改】'''

# 传递任意数量的实参用： *

def make_pizza(size, *topings):

print("\nMaking a " + str(size) + "-inch pizza with following toppings")

for toping in topings:

print("- " + toping)

make_pizza(16, 'pepperoni')

make_pizza(12,'mushrooms', 'green peppers')

# 传递任意数量的关键字参数

def build_proflie(frist, last, **user_info):

profile = {}

profile['frist_name'] = frist

profile['last_name'] = last

for key,value in user_info.items():

profile[key] = value

return profile

user_profile = build_proflie('albert','einstein',

location='princeton',

field='physics')

print(user_profile)

# 导入模块 每个py文件都可以是模块

# import 模块

# from 模块 import 函数

# from 模块 import 函数 as 另一个名字

# import 模块 as 另一个名字

# from 模块 import * 导入模块中所有函数

# 所有import都要放在开头，除非在文件开头使用了注释性语言来描述整个程序