重新打开Python中的文件? [英] Re-open files in Python?

问题描述

说我有这个简单的python脚本:

Say I have this simple python script:

file = open('C:\\some_text.txt')
print file.readlines()
print file.readlines()

运行时，第一个打印将打印一个包含文件文本的列表，而第二个打印将打印一个空白列表.我猜不是完全出乎意料的.但是，是否有一种方法可以回退"文件，以便我可以再次读取它?还是最快的方法只是重新打开它?

When it is run, the first print prints a list containing the text of the file, while the second print prints a blank list. Not completely unexpected I guess. But is there a way to 'wind back' the file so that I can read it again? Or is the fastest way just to re-open it?

推荐答案

您可以通过调用 seek() :

You can reset the file pointer by calling seek():

file.seek(0)

会做到的.您的第一个readlines()之后需要该行.请注意，file必须支持随机访问才能使以上内容正常工作.

will do it. You need that line after your first readlines(). Note that file has to support random access for the above to work.

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