[Python-Dev] Fatal scoping error from the twilight zone
Ka-Ping Yee
ping@lfw.org
Sat, 10 Feb 2001 16:22:48 -0800 (PST)
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--8323328-1457723440-981850968=:4249
Content-Type: TEXT/PLAIN; charset=US-ASCII
Houston, we may have a problem...
The following harmless-looking function:
def getpager():
"""Decide what method to use for paging through text."""
if type(sys.stdout) is not types.FileType:
return plainpager
if not sys.stdin.isatty() or not sys.stdout.isatty():
return plainpager
if os.environ.has_key('PAGER'):
return lambda text: pipepager(text, os.environ['PAGER'])
if sys.platform in ['win', 'win32', 'nt']:
return lambda text: tempfilepager(text, 'more')
if hasattr(os, 'system') and os.system('less 2>/dev/null') == 0:
return lambda text: pipepager(text, 'less')
import tempfile
filename = tempfile.mktemp()
open(filename, 'w').close()
try:
if hasattr(os, 'system') and os.system('more %s' % filename) == 0:
return lambda text: pipepager(text, 'more')
else:
return ttypager
finally:
os.unlink(filename)
produces
localhost[1047]% ./python ~/dev/htmldoc/pydoc.py
Fatal Python error: unknown scope for pipepager in getpager(5) in /home/ping/dev/htmldoc/pydoc.py
Aborted (core dumped)
localhost[1048]%
with a clean build on a CVS tree that i updated just minutes ago.
I was able to reduce this test case to the following:
localhost[1011]% python
Python 2.1a2 (#20, Feb 3 2001, 20:40:19)
[GCC egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)] on linux2
Type "copyright", "credits" or "license" for more information.
>>> def getpager():
... if os.environ.has_key('x'):
... return lambda t: pipepager(t, os.environ['x'])
...
Fatal Python error: unknown scope for pipepager in getpager (1)
Aborted (core dumped)
but not before coming across a bewildering series of working and
non-working cases that left me wondering whether i was hallucinating.
Strange as it may seem, for example, replacing the string constant
'x' with a variable makes the latter example work. Even stranger,
choosing a different name for the variable t can make it work in
some cases but not others!
Please try the following script and see if you get weird results:
code = '''def getpager():
if os.environ.has_key('x'):
return lambda %s: pipepager(%s, os.environ['x'])'''
import string, os, sys
results = {}
for char in string.letters:
f = open('/tmp/test.py', 'w')
f.write(code % (char, char) + '\n')
f.close()
sys.stderr.write('%s: ' % char)
status = os.system('python /tmp/test.py > /dev/null') >> 8
sys.stderr.write('%s\n' % status)
results.setdefault(status, []).append(char)
for status in results.keys():
if not status: print 'Python likes these letters:',
else: print 'Status %d for these letters:' % status,
print results[status]
I get this, consistently every time!
Status 134 for these letters: ['b', 'c', 'd', 'g', 'h', 'j', 'k', 'l', 'o', 'p', 'r', 's', 't', 'w', 'x', 'z', 'B', 'C', 'D', 'G', 'H', 'J', 'K', 'L', 'O', 'P', 'R', 'S', 'T', 'W', 'X', 'Z']
Python likes these letters: ['a', 'e', 'f', 'i', 'm', 'n', 'q', 'u', 'v', 'y', 'A', 'E', 'F', 'I', 'M', 'N', 'Q', 'U', 'V', 'Y']
A complete log of my interactive sessions is attached.
I hope somebody can reproduce at least some of this to assure me
that i'm not going mad. :)
-- ?!ng
Happiness comes more from loving than being loved; and often when our
affection seems wounded it is is only our vanity bleeding. To love, and
to be hurt often, and to love again--this is the brave and happy life.
-- J. E. Buchrose
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