self search_string search_string self replace_string replace_string def process_files(self)'''perform search and replace on all files in the temporary directory''for filename in self temp_directory iterdir()with filename open(as filecontents file read(contents contents replaceself search_stringself replace_stringwith filename open(" "as filefile write(contentsif __name__ ="__main__"zipreplace(*sys argv[ : ]process_zip(this code is bit shorter than the original versionsince it inherits its zip processing abilities from the parent class we first import the base class we just wrote and make zipreplace extend that class then we use super(to initialize the parent class the find_replace method is still herebut we renamed it to process_files so the parent class can call it from its management interface because this name isn' as descriptive as the old onewe added docstring to describe what it is doing nowthat was quite bit of workconsidering that all we have now is program that is functionally not different from the one we started withbut having done that workit is now much easier for us to write other classes that operate on files in zip archivesuch as the (hypothetically requestedphoto scaler furtherif we ever want to improve or bug fix the zip functionalitywe can do it for all classes by changing only the one zipprocessor base class maintenance will be much more effective see how simple it is now to create photo scaling class that takes advantage of the zipprocessor functionality (notethis class requires the third-party pillow library to get the pil module you can install it with pip install pillow from zip_processor import zipprocessor import sys from pil import image class scalezip(zipprocessor)def process_files(self)'''scale each image in the directory to ''for filename in self temp_directory iterdir()im image open(str(filename)