Rename multiple files in multiple sub folders using python

Question

Beginer python coder here.

I've been struggling with this problem for few days now and finally given up and seeking help.

Problem illustrated:

All Student folders:
Student a: 
    Work.pdf
    Work2.pdf
Student b:
    Work.pdf
    Work2.pdf 

Folders Student a and student b, contain two files each. I need to rename those files as homework1.pdf and homework2.pdf

Ofcourse in real life I have more than 2 folders. I thought a for loop using os.rename() would work but I can't get it to change multiple files.

Here's what I tried

import os

# assign directory
directory = 'all Student folders'

# iterate over files 

for root, dirs, files in os.walk(directory):
  for filename in files:
    if filename =='work.pdf':
      os.rename('work.pdf', homework1.pdf')
 

Many thanks...

Answer 1

You need to use the file in the dir where it is.

import os

# assign directory
directory = "all Student folders"

# iterate over files

for root, _, files in os.walk(directory):
    for file_name in files:
        if file_name == "Work.pdf":
            os.rename(f"{root}/{file_name}", f"{root}/homework1.pdf")
        else:
            new_name = file_name.replace(f"Work", "homework")
            os.rename(f"{root}/{file_name}", f"{root}/{new_name}")