selective_copy.py

import os, shutil


folder = input('Enter the absolute filepath of the directory you wish to copy from: ')
extension = input("Enter the extension you'd like to copy: ")
destination = input("Enter destination folder's absolute filepath: ")
for folders, subfolders, filenames in os.walk(folder):
        for filename in filenames:
            if filename.endswith('{}'.format(extension)):
                shutil.copy(os.path.join(folders, filename), destination)
print('Selective copying has finished - all files of', extension, 'type have been copied from', os.path.basename(folder), 'to', os.path.basename(destination))