change 0-based file names to 1-based file names

index_up.py

import os
path = "YourPath"
_ext = ".png"

for (dirpath, dirnames, filenames) in os.walk(path):
    if '0000' + _ext in filenames:
        print(f"{dirpath} has zero-based index")
        for filename in list(reversed(filenames)):
            if filename[4:] == _ext:
                os.rename(os.path.join(dirpath, filename), os.path.join(dirpath, str(int(filename[:4]) + 1).zfill(4) + _ext))