建网站 3年服务,福田商城网站建设,营销网站的关键字,织梦网站手机页怎么做Python如何传递任意数量的实参 传递任意数量的实参
形参前加一个 * #xff0c;Python会创建一个已形参为名的空元组#xff0c;将所有收到的值都放到这个元组中#xff1a; def make_pizza(*toppings):print(\nMaking a pizza with the following toppings: Python会创建一个已形参为名的空元组将所有收到的值都放到这个元组中 def make_pizza(*toppings):print(\nMaking a pizza with the following toppings: )for topping in toppings:print(- topping)
make_pizza(pepperoni)
make_pizza(mushroom, green peppers, extra cheese) 不管函数收到多少实参这种语法都管用。
1. 结合使用位置实参和任意数量实参 def make_pizza(size, *toppings):print(\nMaking a str(size) -inch pizza with the following toppings: )for topping in toppings:print(- topping)
make_pizza(16, pepperoni)
make_pizza(12, mushroom, green peppers, extra cheese) 运行结果 Making a 16-inch pizza with the following toppings:
- pepperoni
Making a 12-inch pizza with the following toppings:
- mushroom
- green peppers
- extra cheese2. 使用任意数量的关键字实参 def build_profile(first, last, **user_info):profile dict()profile[first_name] firstprofile[last_name] lastfor key, value in user_info.items():profile[key] valuereturn profile
user_profile build_profile(albert, einstein, locationprinceton, fieldphysic)
print(user_profile) 形参**user_info中的两个星号让python创建了一个名为user_info的空字典。 Python中的返回值是什么 返回值
函数并非总是直接显示输出相反它可以处理一些数据并返回一个或一组值。函数的返回值被称为返回值。
1. 简单的返回值 def get_formatted_name(first_name, last_name):full_name first_name last_namereturn full_name.title()
musician get_formatted_name(jimi, hendrix)
print(musician) 调用返回值的函数时需要提供一个变量存储返回的值。
2. 让实参变成可选的 def get_formatted_name(first_name, middle_name, last_name):full_name first_name middle_name last_namereturn full_name.title()
musician get_formatted_name(john, lee, hooker)
print(musician) 然而并非每个人都有中间名怎样让中间名变成可选呢 def get_formatted_name(first_name, last_name, middle_name ):if middle_name:full_name first_name middle_name last_nameelse:full_name first_name last_namereturn full_name.title()
musician get_formatted_name(john, hooker, lee)
print(musician)
musician get_formatted_name(jimi, hendrix)
print(musician) 给形参中间名一个空字符为默认值将其移动至形参列表的末尾调用函数时确保实参中间名方最后。
3. 返回字典 def build_person(first_name, last_name):person {first: first_name, last: last_name}return person
musician build_person(jimi, hendrix)
print(musician) 扩展函数使其接受可选值 def build_person(first_name, last_name, age ):person {first: first_name, last: last_name}if age:person[age] agereturn person
musician build_person(jimi, hendrix, age27)
print(musician) 4. 结合使用函数和while循环 def get_formatted_name(first_name, last_name):full_name first_name last_namereturn full_name.title()
while True:print(\nPlease tell me your name:)f_name input(First name: )l_name input(Last name: )formatted_name get_formatted_name(f_name, l_name)print(\nHello, formatted_name !) 循环调用定义的函数say hello everyone!!! 该在什么地方提供推出呢 def get_formatted_name(first_name, last_name):full_name first_name last_namereturn full_name.title()
while True:print(\nPlease tell me your name:)print((enter q at any time to quit))f_name input(First name: )if f_name q:breakl_name input(Last name: )if l_name q:breakformatted_name get_formatted_name(f_name, l_name)print(\nHello, formatted_name !) 每次提示用户输入时均可推出。
