Question

我正在编写一个简单的python程序，它允许我们列出目录中的所有视频文件，并根据用户输入播放它们。但是，我在运行此代码时得到一个超出范围错误的列表。

代码：

import os

from subprocess import Popen

def processFile(currentDir):
    # Get the absolute path of the currentDir parameter
    currentDir = os.path.abspath(currentDir)                                         
    global list
    list=[]

    filesInCurDir = os.listdir(currentDir)

    # Traverse through all files
    for file in filesInCurDir:
        curFile = os.path.join(currentDir, file)

        # Check if it's a normal file or directory
        if os.path.isfile(curFile):
            # Get the file extension
            curFileExtension = curFile[-3:]

            # Check if the file has an extension of typical video files
            if curFileExtension in ['avi', 'dat', 'mp4', 'mkv', 'vob']:
                # We have got a video file! Increment the counter
                processFile.counter += 1
                list.append('curFile')

                # Print it's name
                print(processFile.counter,  file)
        else:
            # We got a directory, enter into it for further processing
            processFile(curFile)
if __name__ == '__main__':
    # Get the current working directory
    currentDir = os.getcwd()

    print('Starting processing in %s' % currentDir)

    # Set the number of processed files equal to zero
    processFile.counter = 0

    # Start Processing
    processFile(currentDir)

    # We are done. Exit now.
    print('\n -- %s Movie File(s) found in directory %s --' \
          % (processFile.counter, currentDir))
    print('Enter the file you want to play')
    x = int(input())
    path = list[x-1]
    oxmp=Popen(['omxplayer',path])

Answer 1

啊，啊，找到了你的问题。

在processFile中，您说

def processFile(currentDir):
    # ...
    global list
    list=[]
    # ...
    processFile(...)

这意味着，无论何时递归，您都要再次清除列表！这意味着processFile.counter号码与列表的实际长度不同步。

关于此的三点说明：

将变量存储在像processFile.counter这样的函数上通常不赞成，AFAIK。
不需要单独的柜台;您只需添加len(list)即可找到列表中的条目数。
要修复列表问题本身，请考虑在函数外部初始化列表变量，或将其作为要修改的参数传递。

列出python代码中的超出范围错误

1 个答案: