在Python中读取目录的安全方法

Question

try:
    directoryListing = os.listdir(inputDirectory)
    #other code goes here, it iterates through the list of files in the directory

except WindowsError as winErr:
    print("Directory error: " + str((winErr)))

这工作正常,我已经测试过,当目录不存在时它不会窒息而死,但我正在读一本Python书,我应该在打开文件时使用"with".有没有一种首选方式来做我正在做的事情？

Answer 1

你很好。该os.listdir功能不会打开文件，所以最终你没问题。with您可以在读取文本文件或类似文件时使用该语句。

with 语句的示例：

with open('yourtextfile.txt') as file: #this is like file=open('yourtextfile.txt')
    lines=file.readlines()                   #read all the lines in the file
                                       #when the code executed in the with statement is done, the file is automatically closed, which is why most people use this (no need for .close()).