When using Python (Django rest framework), why does attempting to delete a temporary file in unit test tearDown() result in an error that says the file is currently being utilized?

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This error occurs because the file has not been closed or released from memory before attempting to delete it. It is important to close or release files after they have been used in order to free up memory and prevent errors like this. In unit tests, it is best practice to use context managers or the "with" statement to ensure that files are properly closed or released.