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Oct 26, 2009, 12:40 PM
Post #1 of 16
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[issue7210] Proposed Syntax Checks in Test Suite
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New submission from Chuck Rhode <CRhode [at] LacusVeris>:
PythonTidy is a code beautifier written three years ago and downloaded
numerous times.
o http://lacusveris.com/PythonTidy/PythonTidy.python
It suffers a bug, which has only recently come to light. It considers
the following lines equivalent:
if False is (2 is 3): pass
if False is 2 is 3: pass
They're not. PythonTidy handles other non-associative operators such as
division correctly. I was unable to generalize from arithmetic
operators to comparison operators because the Abstract Syntax Tree (AST)
generated by the *compiler* module returns a different structure for them.
I tested PythonTidy by running the Python Test Suite (the *test* module
scripts) through it and executing the results, thought I had all my
bases covered because most tests succeeded, and missed this case, so I
am suggesting an amplification of the Python Test Suite for developers
who may be using it for purposes other than testing Python.
I wish to add these lines to the foot of *test_grammar.py*.
verify(16 // (4 // 2) == 8, '16 // (4 // 2) == 8')
verify((16 // 4) // 2 == 2, '(16 // 4) // 2 == 2')
verify(16 // 4 // 2 == 2, '16 // 4 // 2 == 2')
verify((False is (2 is 3)) == True, '(False is (2 is 3)) == True')
verify(((False is 2) is 3) == False, '(((False is 2) is 3) == False')
verify((False is 2 is 3) == False, '(False is 2 is 3) == False')
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components: Tests
files: test_grammar.patch
keywords: patch
messages: 94501
nosy: ChuckRhode
severity: normal
status: open
title: Proposed Syntax Checks in Test Suite
type: feature request
versions: Python 2.5
Added file: http://bugs.python.org/file15206/test_grammar.patch
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