Python Deleting Certain File Extensions

问题

I'm fairly new to Python, but I have gotten this code to work, and in fact, do what it's intended to do.

However, I'm wondering if there is a more efficient way to code this, perhaps to enhance the processing speed.

 import os, glob


def scandirs(path):
    for currentFile in glob.glob( os.path.join(path, '*') ):
        if os.path.isdir(currentFile):
            print 'got a directory: ' + currentFile
            scandirs(currentFile)
        print "processing file: " + currentFile
        png = "png";
        jpg = "jpg";
        if currentFile.endswith(png) or currentFile.endswith(jpg):
            os.remove(currentFile)

scandirs('C:\Program Files (x86)\music\Songs')

Right now, there are about 8000 files, and it takes quite some time to process every file and check if it indeed ends in png or jpg.

回答1:

Since you are recursing through subdirectories, use os.walk:

import os

def scandirs(path):
    for root, dirs, files in os.walk(path):
        for currentFile in files:
            print "processing file: " + currentFile
            exts = ('.png', '.jpg')
            if currentFile.lower().endswith(exts):
                os.remove(os.path.join(root, currentFile))

回答2:

If the program works and the speed is acceptable, I wouldn't change it.

Otherwise, you could try unutbu's answer.

Generally, I would leave away the

png = "png"
jpg = "jpg"

stuff as I don't see any purpose in not using the strings directly.

And better test for ".png" instead of "png".

An even better solution would be to define

extensions = ('.png', '.jpg')

somewhere centally and use that in

if any(currentFile.endswith(ext) for ext in extensions):
    os.remove(currentFile)

.

来源：https://stackoverflow.com/questions/7833715/python-deleting-certain-file-extensions