Is it possible to create a dynamic path within a Python script?

Question

The idea is, I have various directories with a random number of files in each directory. Currently, I have a working script that I can copy into each dir and run and it will rename each file in that dir to my liking.

Here is my pain point: If I were to copy this script to another dir, I would have to change the path within my script so it renames the files in the correct directory. If I do not change the path in my script, it will rename files from the previous dir, which is not my intention.

My question is: can I create a dynamic reference in my script so that the script will update its own path so it will rename the files in the intended dir? This way, I will only have to copy the script to the new dir and run it.

I am using os.rename() to rename my files.

os.rename is using a path that has a prefixed 'r'. This is an example of how I am doing this with os.rename():

python
folder = r'M:\Python Projects\Rename Files\Repo\\'
source = folder + file_name 
destination = folder + d + " " + lookup_table[lookup_val] + ".pdf"
os.rename(source, destination)

I would like my folder variable to be dynamic. So for example when I copy the script over to another dir, folder would be the path of the current dir.