bpo-41352: Raise UnsupportedOperation for FileIO.readall() in "w" mode #21568
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check self->readable added tests for FileIO.read and FileIO.readall
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I ran the tests with and without the code change. The read test passed with and without the patch, the readall test failed without and passed with. So this seems correct.
What does readall do currently on a file which was opened with "w"? Does it sometimes work?
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You need to add a news entry to this PR. You can created it with this form: https://blurb-it.herokuapp.com/add_blurb Look at some merged PRs to see what they look like. |
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Hi @iritkatriel. I worked with @evanWang1409 to submit this patch and can answer your questions. The
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Lib/test/test_fileio.py
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| w = os.fdopen(w, "w") | ||
| w.write("hello") | ||
| w.close() |
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Please use a with statement.
Lib/test/test_fileio.py
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| w = os.fdopen(w, "w") | ||
| w.write("hello") | ||
| w.close() |
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Please use a with statement.
| with self.assertRaises(_io.UnsupportedOperation): | ||
| f.read() | ||
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| def testReadallWithWritingMode(self): |
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These new test methods have too much duplicated code.
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I (or @evanWang1409) can pull out the pipe setup into a separate method, if you would like. Otherwise I'm not sure what else is the right direction here. It's not clear what abstraction would make sense given that there are only two callers right now and this is a small test case.
Modules/_io/fileio.c
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| if (!self->readable) | ||
| return err_mode("reading"); |
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The PEP 7 style guide states that "all new C code requires braces".
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Unfortunately can't checkout: My clone was up to date yesterday and local copy, not having issues with other PRs. |
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The following commit authors need to sign the Contributor License Agreement: |
Signed CLA. Will come back and see if this fix is still needed. |
check self->readable
added tests for FileIO.read and FileIO.readall
https://bugs.python.org/issue41352