Hello and welcome back. In this chapter, we will create two methods used to filter out the unwanted audio and image file. The rules of filtering are as follows.
- The file name cannot contain a blank space, the ‘-‘ or the ‘_’ or the ‘,’ or numbers.
- The file extension cannot contain a capital letter.
- Only a few valid audio or image file extensions are allowed to get past the filter.
- There must be a file extension.
Any rule violation will make the program returns False or else the program will return True.
Below is the methods that will act as the filter.
def is_audio(file_name): if(prelim(file_name) == False): return False audio = ['.mp3', '.flac', '.alac', '.aac'] for ex in audio: if(ex in file_name): return True return False def is_img(file_name): if(prelim(file_name) == False): return False img = ['.jpg', '.jpeg', '.png', '.bmp', '.gif'] for ex in img: if(ex in file_name): return True return False def prelim(file_name): if(" " in file_name or "-" in file_name or "_" in file_name or "," in file_name): return False # no uppercase for the file extension try: index_ = file_name.index('.') if(file_name[index_:].isupper()): return False except ValueError: return False numbers = ['1','2','3','4','5','6','7','8','9','0'] for num in numbers: if (num) in file_name[0:index_]: return False
OK, now let us try out the above program.
print(is_audio('x_.mp3')) // False print(is_audio('x-.mp3')) // False print(is_img('x10.gif')) // False print(is_img('x.PNG')) // False print(is_img('x.png')) // True print(is_audio('y,.flac')) // False print(is_img('x')) // False print(is_audio('y.png')) // False print(is_audio('y m c a.alac')) // False print(is_audio('YOUNGMANYOUGOTNOPLACETOGO.alac')) // True
Well there you have it, we will start our next python project in the next chapter as I have promised you to.
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