How to rename path name?

Question

I have .dcm files in a path like below (old_path);

old_path: Mass-Test_P_00016_LEFT_MLO_1/10-04-2016-DDSM-15563/1-cropped images-77287/000000.dcm

I have to rename the path like below (good_path);

good_path: Mass-Test_P_00016_LEFT_MLO_1/15563/77287/000000.dcm

Note that I keep only the last 5 digits in the sub-folders as shown above.

Please anyone show me how this must be done? This is my attempt...

os.chdir(path to data) os.listdir() >> ['Mass-Test_P_00016_LEFT_MLO_1', 'Mass-Test_P_00016_LEFT_MLO'] temp = os.walk('Mass-Test_P_00016_LEFT_MLO_1', topdown=False) for root, dirs, files in temp: for name in files: old_path = os.path.join(root, name) print("old_path: ", old_path) first = old_path.split('/')[1][-5:] second = old_path.split('/')[2][-5:] #print(first, second) good_path = os.path.join(old_path.split('/')[0], first, second, old_path.split('/')[3]) print("good_path: ", good_path) os.rename(old_path, good_path)

I was able to set the good_path as I want. But it is not overwriting the subfolders names.

Suggest you use os.path.split() to split paths (instead of e.g. old_path.split('/')). — martineau
– martineau, Commented Mar 19, 2020 at 20:44
What happens when you run your code? What do you want it to do differently? — Code-Apprentice
– Code-Apprentice, Commented Mar 19, 2020 at 20:50
Tip: set the result of old_path.split('/') to a variable so you don't have to keep calling it. — Code-Apprentice
– Code-Apprentice, Commented Mar 19, 2020 at 20:51
@Code-Apprentice. I get the following error. But there is no issue with the file location. FileNotFoundError: [Errno 2] No such file or directory: 'Mass-Test_P_00016_LEFT_MLO_1/10-04-2016-DDSM-15563/1-cropped images-77287/000000.dcm' -> 'Mass-Test_P_00016_LEFT_MLO_1/15563/77287/000000.dcm' — Mass17
– Mass17, Commented Mar 19, 2020 at 21:18
The error says the file you are trying to rename doesn't exist. Likely the problem is because you are using a relative path. So the file you think you are renaming isn't the actual file that the program is actually renaming. — Code-Apprentice
– Code-Apprentice, Commented Mar 19, 2020 at 21:21

P.S.K · Accepted Answer · 2020-03-19 21:33:30Z

You need to rename each node of your path from the root (the left most folder of old_path) to the leaf (your .dcm file). You might be interested in using os.renames instead of os.rename

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