Python 递归访问目录；定义一个嵌套函数；递归函数打印斐波那契数列；map函数；filter函数过滤；reduce求和一、递归访问目录二、定义一个嵌套函数三、定义一个递归函数：打印斐波那契数列四、对列表进行排序五、计算三个列表，相同位置元素之和六、利用filter函数过滤列表中所有带a的字符串七、利用reduce计算1 + 2 + 3…+ 100之和

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import os

def list_dir_content(dir_path, count=0):
    for file_name in os.listdir(dir_path):
        sub_path = os.path.join(dir_path, file_name)
        if os.path.isdir(sub_path):
            print(count * "t" + file_name)
            sub_count = count + 1
            list_dir_content(sub_path, sub_count)
        if os.path.isfile(sub_path):
            print(count * "t" + file_name)


list_dir_content("E:Pythonpython_code")

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def outer():
    print("This is outer function")

    def inner():
        print("This is inner function")
    inner()
outer()

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def func(a):
    def func_1(n):
        if n == 0:
            return 0
        elif n == 1 or n == 2:
            return 1
        else:
            return func_1(n-2) + func_1(n-1)
    list_1 = []
    for i in range(a):
        list_1.append(func_1(i))
    return list_1

print(func(10))

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list_data = ["grape", "peach", "berry", "pineapple", "apple", "strawberry", "watermelon"]
# list_data.sort()
# print(list_data)

data = lambda x: ([-1], [0])
list_data.sort(key=data)
print(list_data)

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list1 = [1, 2, 3]
list2 = [4, 5, 6]
list3 = [7, 8, 9]
sum_list = map(lambda x, y, z: (x+y+z), list1, list2, list3)
print(list(sum_list))

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list_data = ["grape", "what", "which", "you", "friend", "am"]
result = filter(lambda x: "a" not in x, list_data)
print(list(result))

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list_data = ["grape", "what", "which", "you", "friend", "am"]
result = filter(lambda x: "a" not in x, list_data)
print(list(result))