Filing has to mention regular expressions first
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Basic usage of python:re module

1. List all files under the folder

Library os used
Python os.path() module in detail with an example

os.walk() usage

[(Current Directory List), (Subdirectory List), (File List)]os. Walk (tree folder name)
os.walk() returns a list of three tuple-type elements.
A table element with an index value of 0 is the folder name, from which you can know which folder is currently being processed.
A table element with an index value of 1 is a list of the next folders used to know how many lower folders there are in this folder by what name.
An element with an index value of 2 is a list of all the files in this folder, listing all the file names in this folder.
Combines the contents of all downward tree directory structures from the returned list data.

import os
list_all=[]#Initialize an empty list
for root ,dirs,files in os.walk(r'C:\Users\Shineion\Desktop\New Folder'):
    for name in files:

        file_path=os.path.join(root,name)#Files with paths
        file_name=os.path.split(file_path)[-1]
        list_all.append(file_name)
print(list_all)

If the folder contains subfolders, the subfolders have files. The program has no effect and can read all the file names as well.

2. Use regular re to modify file names

import os
import re

#First define the rules, such as if we need to extract all the picture names and modify them

pattern=re.compile(r'.+\.png')

i=1
for root ,dirs,files in os.walk(r'C:\Users\Shineion\Desktop\New Folder'):
    for name in files:

        file_path=os.path.join(root,name)#File name containing path
        matching=pattern.search(file_path)#Match Picture
        if matching:
            os.rename(file_path,os.path.split(file_path)[-2]+ '/{}.png'.format(i))
            i+=1
            print('Successful modification')

Explain

os.path.split(file_path)[-2]:[-2]: is to get the picture path (remove the part of the name)

File renaming that was previously written to another version
: python batch modify picture names (can also be used to batch modify file names)

3. Bulk Delete and Copy Files

1. Bulk Copy Files

Example: We copy the PDF from the original folder to a new folder: D:\Yudenwu Test 1

First D:\Yu Tengwu Test 1, need to manually create new

import os
import re

#Define rules first, such as we need to put all pdf files

pattern=re.compile(r'.+\.pdf')


for root ,dirs,files in os.walk(r'C:\Users\Shineion\Desktop\New Folder'):
    for name in files:

        file_path=os.path.join(root,name)#Files with paths
        print(file_path)
        matching=pattern.search(file_path)#Match pdf
        if matching:
            command_line='copy %s D:\\Yu Dengwu Test 1' % file_path.replace('/','\\')
            os.system(command_line)
            print('Copy succeeded')

os.system(command_line) calls cmd to execute the copy file.
cmd copy file command:
copy Source File Destination Path

Copied files

2. Bulk Delete Files

Delete pdf under original folder

Instruction os. Remove (file)

import os
import re

#Define rules first, such as we need to put all pdf files

pattern=re.compile(r'.+\.pdf')


for root ,dirs,files in os.walk(r'C:\Users\Shineion\Desktop\New Folder'):
    for name in files:

        file_path=os.path.join(root,name)#Files with paths
        print(file_path)
        matching=pattern.search(file_path)#Match pdf
        if matching:
            os.remove(file_path)
            print('Delete succeeded')

Looking at the original folder, we found that the pdf file has been deleted

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