Python reads files in folders and files in subfolders

1. os.listdir()Read the file name and subfolder name under the target folder, and will not recursively read the subfolder

   names = os.listdir(".\\")
   for i in names:
   	print(i)
   	path = os.path.join(".\\", i) ##重要
   	if os.path.isdir(path):
   		print(path, " is dir")
   	if os.path.isfile(path):
   		print(path, " is file")
   

2. Method 1: root, dirs, files = os.walk()Recursively read all files under the folder and subfolders . Method 2: You can also use os.listdir() to judge that it is a folder and then write a recursive program by yourself in os.listdir()

   for root,dirs,files in os.walk(dirname):
       for file in files:
           path = os.path.join(root,file)
           print(path)
   

3. example

   import os
   
   dirname = ".\..\dir1"
   #判断文件夹dirname是否存在
   if not os.path.exists(dirname):
       print("error: folder \"", dirname, "\" not exits!")
       sys.exit()
   ## 读取文件夹dirname下的文件和子文件夹，并判断是文件还是文件夹
   
   ##只读取文件夹下一级文件名和子文件夹，并不会列举子文件夹里文件
   names = os.listdir(dirname)
   for name in names:
       path = os.path.join(dirname, name)  ##很有必要，不然结果会不对
       if os.path.isdir(path): #文件夹
           print(name, " is dir")
       if os.path.isfile(path): #文件
           print(name, " is file")
           
   # 递归获得文件夹和子文件夹下所有文件名
   for root,dirs,files in os.walk(dirname):
       for file in files:
           path = os.path.join(root,file)
           print(path)