Python函数

def message():
    temp = 20
    wetness = 30
    # 如果想要返回多个值，可以使用元祖
    # return (temp, wetness)
    # 如果返回的类型是元祖,可以省略括号
    return 20, 30


result = message()
print(result)
# 如果返回的是元祖，同时希望单独处理元祖中的数据，可以使用多个变量，依次接受函数的返回结果
print(result[0])
print(result[1])
gl_temp, gl_wetness = message()
print(gl_temp)
print(gl_wetness)
# 交换两个数值
a = 6
b = 10
a = a + b
b = a - b
a = a - b
print(a)
print(b)
# 交换两个值的第二种写法,利用元祖
a, b = (b, a)
print(a)
print(b)
# 交换两个值的第三种写法，利用元祖
a, b = b, a
print(a)
print(b)


def demo(num, num_list):
    num += num
    # 列表变量使用+不会做相加再赋值的操作
    # num_list=num_list+num_list本质上是在调用列表的extend
    # num_list += num_list
    num_list.extend(num_list)
    print("num:%d" % num)
    print(num_list)
    pass


num = 3
num_list = [1, 2, 3]
demo(num, num_list)
print(num)
print(num_list)
# 排序
gl_list = [3, 9, 4]
gl_list.sort()
print(gl_list)
gl_list.sort(reverse=True)
print(gl_list)


# 指定参数默认值，必须保证缺省参数在参数列表最后一个位置
def print_info(name, title="", gender=True):
    genderText = "男生"
    if not gender:
        print("男生")
    else:
        print("女生")


print_info("小安", False)
print_info("小安")
print_info("小安", gender=False)


# 多值参数
def demo(num, *nums, **person):
    print(num)
    print(nums)
    print(person)


demo(1, 2, 3, 4, 5, name="小明", age=12)


def subNumbers(*args):
    num = 0
    print(args)
    for n in args:
        num += n
    return num


result = subNumbers(1, 2, 3)
print(result)


# 元祖和字典的拆包
def demos(*args, **kwargs):
    print(args)
    print(kwargs)


gl_num = (1, 2, 3)
gl_dicts = {"name": "小明", "age": 123}
# demos(gl_num, gl_dicts)
demos(1, 2, 3, name="小明", age=123)
# demos(*gl_num,**gl_dicts)

(20, 30)
20
30
20
30
10
6
6
10
10
6
num:6
[1, 2, 3, 1, 2, 3]
3
[1, 2, 3, 1, 2, 3]
[3, 4, 9]
[9, 4, 3]
女生
女生
男生
1
(2, 3, 4, 5)
{'name': '小明', 'age': 12}
(1, 2, 3)
6
(1, 2, 3)
{'name': '小明', 'age': 123}