The `io.FileIO.close()` method in Python is used to close an open file. Once a file has been opened for reading or writing using the `io.FileIO()` constructor, it is necessary to close the file after all operations are completed. This is important to ensure that all pending data is written to the file and system resources are freed up. The `close()` method is called on the file object and does not take any arguments. After calling `close()`, the file object can no longer be used for any I/O operations.
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