How to change the file extension in files in a list

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I have this code for opening a folder with these directories. Some of them have the extension html but not all of them. How can I change all the files in my three subdirectories that do not have an extension html in .html ?

from os import walk
mypath = ("/directory/path/to/folder")
f = []
for (dirpath,dirnames,filenames) in walk(mypath):
    f.extend(filenames)
    print(f)

If you are on Python 3.4 or higher, consider using pathlib.

Here is a solution for your problem using that:

from pathlib import Path

mypath = Path('/directory/path/to/folder')

for f in mypath.iterdir():
    if f.is_file() and not f.suffix:
        f.rename(f.with_suffix('.html'))

If you need to walk down to sub-directories as well, you can use the Path.glob() method to list all directories recursively and then process each file in that directory. Something like this:

from pathlib import Path

mypath = Path('/directory/path/to/folder')

for dir in mypath.glob('**'):
    for f in dir.iterdir():
        if f.is_file() and not f.suffix:
            f.rename(f.with_suffix('.html'))

And here is one more way to walk down all directories and process all files:

from pathlib import Path

mypath = Path('/directory/path/to/folder')

for f in mypath.glob('*'):
    if f.is_file() and not f.suffix:
        f.rename(f.with_suffix('.html'))

Using Path.glob() with two asterisks will list all sub-directories and with just one asterisk it will list everything down that path.

I hope that helps.

How to Batch Change File Extensions for Windows Files, You're free to change filenames as you need, but you should exercise caution when changing file extensions because Windows uses the extension to figure out � Move to the end of the name and type in .XXX or whatever the type is for the file you want it to be, i.e. .TXT for text files, .XLS for Excel files, etc. Obviously, the file has to have originally been from that program that you are changing the file extension too.

Call this function with your path.

import os
import os.path


def ensure_html_suffix(top):
    for dirpath, _, filenames in os.walk(top):
        for filename in filenames:
            if not filename.endswith('.html'):
                src_path = os.path.join(dirpath, filename)
                os.rename(src_path, f'{src_path}.html')

Renaming files and file extensions, If you are on Python 3.4 or higher, consider using pathlib. Here is a solution for your problem using that: from pathlib import Path mypath� That means the extension of all the files were changed successfully. So, the command to change the extension of multiple files at once is ren *.current file extension *.new file extension. Hence using this command you can change the extensions multiple files in a bulk within few seconds.

First, write an image path generator with the following function.

import os

def getimagepath(root_path):
    for root,dirs,filenames in os.walk(root_path):
        for filename in filenames:
            yield(os.path.join(root,filename))

Input your folder path into the function. Then run a for loop checking the name for ending with html, then change the name with os.rename

paths = getimagepath("............................")
for path in paths:
    if not path.endswith('.html'):
         os.rename(path,path+'.html')

How to change the file extension in files in a list, Change Multiple File Extensions in Command Prompt In this video I will show you how you can Duration: 3:49 Posted: Nov 4, 2014 Substituting extensions in a list of whitespace-separated file names is a common requirement, and there are built-in features for this. If you want to add an x at the end of every name in the list: FILES_OUT = $(FILES_IN:=x) The general form is $(VARIABLE:OLD_SUFFIX=NEW_SUFFIX).

ff = []
for (dirpath,dirnames,filenames) in os.walk(mypath):
    for f in filenames:
        if not f.endswith(".html"): #check if filename does not have html ext
            new_name = os.path.join(dirpath,f+".html")
            os.rename(os.path.join(dirpath,f),new_name) #rename the file
            ff.append(f+".html")
        else:
            ff.append(f)
    print(ff)

Change Multiple File Extensions in Command Prompt, The easiest was to change a file's extension is to save the file as a In the Advanced settings list, scroll down until you see Hide extensions for known file types. Click the box to What do I do if my folders show up as files on Windows 10? All the file extensions are hidden by default. However, sometimes you may need to check your file extensions for certain purposes. The following is the method to change file extension in Windows 10. How to Change File Extension in Windows 10. If you want to change file extension after seeing the full file name, you should be cautious about it.

4 Ways to Change a File Extension, How to change file extension for one file; How to change file extension for multiple files; Part 1: Change file extension for one file in Windows 10. Step 1: Show file name extensions if you haven’t done so. Step 2: Click the file for which you want to change the file extension to select it, and then click F2 to make the filename and

Once the Set Associations tool loads, which should only take a second or two, scroll down the list until you see the file extension that you want to change the default program for. If you're not sure what extension the file in question has, right-click it (or tap-and-hold) the file, go to Properties , and look for the file extension in the

To learn more about how to change which program will open a file, read Change default programs in Windows 10. If you don’t see file name extensions when you view files in File Explorer: In the search box on the taskbar, type file explorer, and in the search results, select File Explorer. In File Explorer under View, in the Show/hide group

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  • Did any of the answers helped you? If so, please mark one as accepted. This way you will help other people with the same question.
  • Might be better off with if not path.endswith('.html'). Also check for the . as well encase you get a file name like mynamehtml