Python函数的定义和使用

Python 笔记

一、函数定义

def greet(name):
    print("Hello, " + name + "!")

二、函数调用

greet("Lucy")

Hello, Lucy!

三、函数参数

def add_numbers(a, b):
    return a + b

result = add_numbers(5, 10)
print(result)

15

def greet(name, greeting="Hello"):
    print(greeting + ", " + name + "!")

greet("Lucy")
greet("Tom", "Hi")

Hello, Lucy!
Hi, Tom!

def greet(name, greeting="Hello", punctuation="!"):
    print(greeting + ", " + name + punctuation)

greet("Lucy")
greet("Tom", punctuation="!!!")

Hello, Lucy!
Hello, Tom!!!

四、函数返回值

def add_numbers(a, b):
    return a + b

result = add_numbers(5, 10)
print(result)

15

五、总结