Issue2221: in Idle, exec('xx') raised a SystemError('error return without exception set')
instead of the expected NameError
This happens when sys.stdout is redirected to something that cannot flush().
the flush_io() function must be exception-neutral: don't raise, and don't clear exceptions.
Next step: exec() is not supposed to flush sys.stdout...
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index 111090c..7244aff 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -448,6 +448,17 @@
del l['__builtins__']
self.assertEqual((g, l), ({'a': 1}, {'b': 2}))
+ def test_exec_redirected(self):
+ savestdout = sys.stdout
+ sys.stdout = None # Whatever that cannot flush()
+ try:
+ # Used to raise SystemError('error return without exception set')
+ exec('a')
+ except NameError:
+ pass
+ finally:
+ sys.stdout = savestdout
+
def test_filter(self):
self.assertEqual(list(filter(lambda c: 'a' <= c <= 'z', 'Hello World')), list('elloorld'))
self.assertEqual(list(filter(None, [1, 'hello', [], [3], '', None, 9, 0])), [1, 'hello', [3], 9])