《Python Crash Course》导读（Chapter 8）

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最新推荐文章于 2024-04-30 15:21:06 发布 · 1.2k 阅读

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#python #开发语言

本文详细介绍了Python中函数的定义与使用，包括参数传递、返回值、列表操作及任意数量参数的处理等。通过丰富的实例，帮助读者掌握Python函数的高级用法。

Code：[ZachxPKU/Python Crash Course]

Python Crash Course

Chapter 8 Functions

Chapter 8 Functions

8.1 Defining a function

def greet_user():
    """Display a simple greeting."""
    print("Hello!")

greet_user()

8.1.1 Passing information to a function

def greet_user(username):
    """Display a simple greeting."""
    print(f"Hello, {
     
     username.title()}!")
    
greet_user('Jesse')

8.1.2 Arguments and Parameters

TRY IT YOURSELF

message.py
favorite_book.py

8.2 Passing arguments

8.2.1 Positional arguments

def describe_pet(animal_type, pet_name):
    """Display information about a pet."""
    print(f"\nI have a {
     
     animal_type}.")
    print(f"My {
     
     animal_type}'s name is {
     
     pet_name.title()}.")

describe_pet('hamster', 'harry')

Multiple function calls

def describe_pet(animal_type, pet_name):
    """Display information about a pet."""
    print(f"\nI have a {
     
     animal_type}.")
    print(f"My {
     
     animal_type}'s name is {
     
     pet_name.title()}.")

describe_pet('hamster', 'harry')
describe_pet('dog', 'willie')

Order matters in positional arguments

def describe_pet(animal_type, pet_name):
    """Display information about a pet."""
    print(f"\nI have a {
     
     animal_type}.")
    print(f"My {
     
     animal_type}'s name is {
     
     pet_name.title()}.")

describe_pet('harry', 'hamster')

8.2.2 Keyword arguments

def describe_pet(animal_type, pet_name):
    """Display information about a pet."""
    print(f"\nI have a {
     
     animal_type}.")
    print(f"My {
     
     animal_type}'s name is {
     
     pet_name.title()}.")

describe_pet(animal_type = 'hamster', pet_name = 'harry')

def describe_pet(animal_type, pet_name):
    """Display information about a pet."""
    print(f"\nI have a {
     
     animal_type

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