After opening a file using the open function, it is always recommended to close that file in order to avoid any issues related to operating system processes. As we've seen so far, Python provides the close method for closing files. After closing the file, you cannot use it anymore for reading or writing. Instead, you are required to open the file again, to be able to do any of these operations. You can also use a file object attribute to check if a file is closed. So let's say this, we still have new file dot txt from the previous lecture, which is already closed, as you can see, so let's check new file dot closed, enter.

So Python returns true if the file is indeed closed. Otherwise, it returns false. Another way to close a file is using the with as statement. This was introduced in Python version two point Using this statement, you don't have to worry about closing the file manually using the close method. Instead, the file is closed automatically. Also, the witness statement creates a new file object and the new file if you use the W access method, so let's see how it works.

I will write the code and then explain it. So first I used the width keyword, followed by the open function right here, which is used in the same way as before. Then I added the as keyword and then the file object name. Let's say F. The as keyword right here acts as an assignment operator for the file object. After typing in the file object name, I also use the colon like we did previously for if statements or functions and then indented one level to the right from the width statement, you type in the code to be executed. In this case, I wanted to write a string to the file.

And that's it. Now let's check two things. First if the string was indeed written to the file, and second, that the file was automatically closed, so let's open the file. And indeed We have Hello Python. Great. The string is there.

Now back to the Python interpreter. Let's check F dot closed and it returns true so the file was indeed closed without us having to do it manually. Keep this method of closing files in mind and use it whenever necessary.