This challenge was to create a code to look into the desired folder and pull out only the file extensions of either .exr or .jpg images.

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The process to do so is as follows.

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1. Locate the folder where the images may be.

2. Use regular expressions to create a capture group for the code to extract later.

3. Make an empty list for the extensions.

4. Get a listing of all .exr or .jpg extensions

5. For every file, check to see if the criteria matches, and if so, add the numeric extension to the list.

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The code for this operation is shown below -

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import os
import os.path
import re
import inspect
import glob

fullpath = inspect.getframeinfo(inspect.currentframe()).filename
dirpath = os.path.dirname(os.path.abspath(fullpath))

glob_pattern = os.path.join(dirpath, '*.exr')
paths = glob.glob(glob_pattern)

re_pat = re.compile('(\w+)[._](\d+)[._](exr|jpg)')
extensions = []

for s in paths:
    found_it = re.search(re_pat, s)
    if found_it:
        extensions.append('%s' % found_it.group(2))
print ('Found the following file extensions', extensions)

I also created another code so that whichever folder the code was in, it would run the operation for that folder using the same code as the file renaming process.

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python extend.py

read

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For windows, it would be a .bat file.

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C:/python27/python extend.py

pause