Merged revisions 59333-59370 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r59343 | georg.brandl | 2007-12-05 08:02:47 +0100 (Wed, 05 Dec 2007) | 2 lines

  Fix typo.
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  r59347 | christian.heimes | 2007-12-05 13:31:44 +0100 (Wed, 05 Dec 2007) | 1 line

  Fixed quoting and paths in the sqlite project file
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  r59348 | christian.heimes | 2007-12-05 13:45:11 +0100 (Wed, 05 Dec 2007) | 1 line

  Fixed error in regrtest. I must have missed the spot.
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  r59350 | christian.heimes | 2007-12-05 13:49:14 +0100 (Wed, 05 Dec 2007) | 1 line

  merge -r59315:59316 from py3k: Fix issue #1553: An errornous __length_hint__ can make list() raise a SystemError
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  r59352 | christian.heimes | 2007-12-05 13:52:34 +0100 (Wed, 05 Dec 2007) | 1 line

  Added msg to Misc/NEWS
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  r59354 | andrew.kuchling | 2007-12-05 14:27:20 +0100 (Wed, 05 Dec 2007) | 1 line

  Spelling fix
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  r59356 | georg.brandl | 2007-12-05 18:56:50 +0100 (Wed, 05 Dec 2007) | 3 lines

  Add examples to csv, pprint and traceback docs.
  Written by Ross for GHOP.
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  r59358 | raymond.hettinger | 2007-12-05 19:11:08 +0100 (Wed, 05 Dec 2007) | 1 line

  Error checking was too aggressive (reported by Chris Tismer)
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  r59359 | georg.brandl | 2007-12-05 19:30:48 +0100 (Wed, 05 Dec 2007) | 2 lines

  Add examples to re docs. Written for GHOP by Dan Finnie.
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  r59366 | georg.brandl | 2007-12-05 20:49:21 +0100 (Wed, 05 Dec 2007) | 2 lines

  Fix markup.
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  r59367 | christian.heimes | 2007-12-05 20:57:54 +0100 (Wed, 05 Dec 2007) | 1 line

  Updated documentation and build_tkinter.py script
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  r59368 | georg.brandl | 2007-12-05 21:03:57 +0100 (Wed, 05 Dec 2007) | 2 lines

  Another markup fix.
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  r59369 | ronald.oussoren | 2007-12-05 21:07:36 +0100 (Wed, 05 Dec 2007) | 7 lines

  This "fixes" compilation issues for the Carbon._OSA module on OSX Leopard
  by purging bindings to OSA's debug API's. Those APIs we're completely
  unsupported on OSX 10.4 and are no longer available on OSX 10.5.

  Note that this patches a generated file. This is somewhat acceptable because
  regenerating the file is non-trivial and wouldn't use system headers anyway.
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  r59370 | christian.heimes | 2007-12-05 21:10:38 +0100 (Wed, 05 Dec 2007) | 1 line

  Fixed bug #1557 by using popen.communicate() before popen.wait()
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1 files changed, 2 insertions, 2 deletions

diff --git a/Lib/collections.py b/Lib/collections.py
index a553c9f..f5c524b 100644
--- a/Lib/collections.py
+++ b/Lib/collections.py
@@ -40,7 +40,7 @@ def namedtuple(typename, field_names, verbose=False):
         field_names = field_names.replace(',', ' ').split() # names separated by whitespace and/or commas
     field_names = tuple(field_names)
     for name in (typename,) + field_names:
-        if not name.replace('_', '').isalnum():
+        if not all(c.isalnum() or c=='_' for c in name):
             raise ValueError('Type names and field names can only contain alphanumeric characters and underscores: %r' % name)
         if _iskeyword(name):
             raise ValueError('Type names and field names cannot be a keyword: %r' % name)
@@ -48,7 +48,7 @@ def namedtuple(typename, field_names, verbose=False):
             raise ValueError('Type names and field names cannot start with a number: %r' % name)
     seen_names = set()
     for name in field_names:
-        if name.startswith('__') and name.endswith('__'):
+        if name.startswith('__') and name.endswith('__') and len(name) > 3:
             raise ValueError('Field names cannot start and end with double underscores: %r' % name)
         if name in seen_names:
             raise ValueError('Encountered duplicate field name: %r' % name)