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This article mainly shows you "how to use With sentences in python". The content is simple and clear. I hope it can help you solve your doubts. Let me lead you to study and learn this article "how to use With sentences in python".

With statement

If we want to open a file, we can use the open function to open and read the file

Don't forget to close the file after reading. If not, Python will occupy the resources of the file until the program exits.

F = open ("suchfils.txt", "r") s = f.read () f.close ()

For small scripts, this is not a big deal, but for a program that runs on the server for a long time, the system resources are likely to be eaten up and the system program will crash; so it is a better habit to use Python's with statement to rewrite the program as follows:

With open ("suchfils.txt", "r") as f: s = f.read ()

In this way, there is no need to call the close function. After execution, the file will be closed automatically.

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