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bpo-17852: Doc: Fix the tutorial about closing files (GH-23135) 

Co-authored-by: Inada Naoki <songofacandy@gmail.com>
(cherry picked from commit c8aaf71dde)

Co-authored-by: Volker-Weissmann <39418860+Volker-Weissmann@users.noreply.github.com>
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Miss Islington (bot) 2020-11-26 16:51:54 -08:00 committed by GitHub
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Doc/tutorial/inputoutput.rst
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@ -329,11 +329,16 @@ equivalent :keyword:`try`\ -\ :keyword:`finally` blocks::
If you're not using the :keyword:`with` keyword, then you should call
``f.close()`` to close the file and immediately free up any system
resources used by it. If you don't explicitly close a file, Python's
garbage collector will eventually destroy the object and close the
open file for you, but the file may stay open for a while. Another
risk is that different Python implementations will do this clean-up at
different times.
resources used by it.
.. warning::
Calling ``f.write()`` without using the :keyword:`!with` keyword or calling
``f.close()`` **might** result in the arguments
of ``f.write()`` not being completely written to the disk, even if the
program exits successfully.
..
See also https://bugs.python.org/issue17852
After a file object is closed, either by a :keyword:`with` statement
or by calling ``f.close()``, attempts to use the file object will