Python解包中*和**的最全用法

def add(*args):
    result = 0
    for num in args:
        result += num
    return result

print(add(1, 2, 3))  # 输出 6

def person_info(**kwargs):
    for key, value in kwargs.items():
        print(f"{key}: {value}")

person_info(name="Alice", age=30, country="USA")
# 输出：
# name: Alice
# age: 30
# country: USA

list1 = [1, 2, 3]
list2 = [4, 5, 6]
list1.extend(list2)
print(list1)  # 输出 [1, 2, 3, 4, 5, 6]

# 使用 * 扩展列表
list1 = [1, 2, 3]
list2 = [4, 5, 6]
list1 = [*list1, *list2]
print(list1)  # 输出 [1, 2, 3, 4, 5, 6]

dict1 = {"name": "Alice", "age": 30}
dict2 = {"country": "USA"}
dict1.update(dict2)
print(dict1)
# 输出：{'name': 'Alice', 'age': 30, 'country': 'USA'}

# 使用 ** 扩展字典
dict1 = {"name": "Alice", "age": 30}
dict2 = {"country": "USA"}
dict1 = {**dict1, **dict2}
print(dict1)
# 输出：{'name': 'Alice', 'age': 30, 'country': 'USA'}

def greet(name, *, message="Hello"):
    print(f"{message}, {name}!")

greet("Alice")  # 输出 "Hello, Alice!"

def person_info(name, age, **kwargs):
    print(f"Name: {name}")
    print(f"Age: {age}")
    print("Other Info:")
    for key, value in kwargs.items():
        print(f"{key}: {value}")

person_info(name="Alice", age=30, country="USA", job="Engineer")
# 输出：
# Name: Alice
# Age: 30
# Other Info:
# country: USA
# job: Engineer

fruits = ("apple", "banana", "cherry")
a, b, c = fruits
print(a, b, c)  # 输出 "apple banana cherry"

info = {"name": "Alice", "age": 30}
person_info(**info)  # 传递字典作为关键

字参数
# 输出：
# Name: Alice
# Age: 30

def multiply(*args):
    result = 1
    for num in args:
        result *= num
    return result

numbers = (2, 3, 4)
print(multiply(*numbers))  # 输出 24

def print_colors(**kwargs):
    for key, value in kwargs.items():
        print(f"{key}: {value}")

colors = {"color1": "red", "color2": "blue", "color3": "green"}
print_colors(**colors)  # 传递字典作为关键字参数
# 输出：
# color1: red
# color2: blue
# color3: green

def advanced_example(*args, **kwargs):
    for arg in args:
        print(arg)
    for key, value in kwargs.items():
        print(f"{key}: {value}")

advanced_example(1, 2, 3, name="Alice", age=30)
# 输出：
# 1
# 2
# 3
# name: Alice
# age: 30