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bpo-34084: Fix setting an error message for the "Barry as BDFL" easter egg. by serhiy-storchaka · Pull Request #8262 · python/cpython · GitHub

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bpo-34084: Fix setting an error message for the "Barry as BDFL" easter egg. #8262

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serhiy-storchaka merged 1 commit into from
Jul 23, 2018
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bpo-34084: Fix setting an error message for the "Barry as BDFL" easter egg. #8262

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23 changes: 17 additions & 6 deletions Lib/test/test_flufl.py
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Expand Up @@ -4,18 +4,29 @@
class FLUFLTests(unittest.TestCase):

def test_barry_as_bdfl(self):
code = "from __future__ import barry_as_FLUFL; 2 {0} 3"
code = "from __future__ import barry_as_FLUFL\n2 {0} 3"

zhangyangyu Jul 12, 2018

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

I am not familiar with compile. My question is when flags is passed, what's the meaning of the import here? Is it a must?

serhiy-storchaka Jul 12, 2018

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

It is redundant if flags is passed.

The bug is that this tests is failed if not pass flags.

zhangyangyu Jul 12, 2018

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

I know flags have to be passed. I just don't understand why not simply '2 {0} 3'?.

serhiy-storchaka Jul 12, 2018

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The intention of the test is that from __future__ import barry_as_FLUFL should change grammar. But this doesn't work, and we need to pass flags as a temporary workaround. After fixing this bug we could remove flags.

zhangyangyu Jul 12, 2018

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gotcha. I wrongly thought the from __future__ import ... doesn't work in compile and flags must be passed.
compile(code.format('<>'), '<BDFL test>', 'exec',
__future__.CO_FUTURE_BARRY_AS_BDFL)
self.assertRaises(SyntaxError, compile, code.format('!='),
'<FLUFL test>', 'exec',
__future__.CO_FUTURE_BARRY_AS_BDFL)
with self.assertRaises(SyntaxError) as cm:
compile(code.format('!='), '<FLUFL test>', 'exec',
__future__.CO_FUTURE_BARRY_AS_BDFL)
self.assertRegex(str(cm.exception),
"with Barry as BDFL, use '<>' instead of '!='")
self.assertEqual(cm.exception.text, '2 != 3\n')
self.assertEqual(cm.exception.filename, '<FLUFL test>')
self.assertEqual(cm.exception.lineno, 2)
self.assertEqual(cm.exception.offset, 4)

def test_guido_as_bdfl(self):
code = '2 {0} 3'
compile(code.format('!='), '<BDFL test>', 'exec')
self.assertRaises(SyntaxError, compile, code.format('<>'),
'<FLUFL test>', 'exec')
with self.assertRaises(SyntaxError) as cm:
compile(code.format('<>'), '<FLUFL test>', 'exec')
self.assertRegex(str(cm.exception), "invalid syntax")
self.assertEqual(cm.exception.text, '2 <> 3\n')
self.assertEqual(cm.exception.filename, '<FLUFL test>')
self.assertEqual(cm.exception.lineno, 1)
self.assertEqual(cm.exception.offset, 4)


if __name__ == '__main__':
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3 changes: 1 addition & 2 deletions Parser/parsetok.c
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Expand Up @@ -246,8 +246,7 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
else if ((ps->p_flags & CO_FUTURE_BARRY_AS_BDFL) &&
strcmp(str, "<>")) {
PyObject_FREE(str);
err_ret->text = "with Barry as BDFL, use '<>' "
"instead of '!='";
err_ret->expected = NOTEQUAL;
err_ret->error = E_SYNTAX;
break;
}
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4 changes: 4 additions & 0 deletions Python/pythonrun.c
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Expand Up @@ -1348,6 +1348,10 @@ err_input(perrdetail *err)
msg = "unexpected indent";
else if (err->token == DEDENT)
msg = "unexpected unindent";
else if (err->expected == NOTEQUAL) {
errtype = PyExc_SyntaxError;
msg = "with Barry as BDFL, use '<>' instead of '!='";
}
else {
errtype = PyExc_SyntaxError;
msg = "invalid syntax";
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