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author | Raymond Hettinger <python@rcn.com> | 2007-10-16 19:18:30 +0000 |
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committer | Raymond Hettinger <python@rcn.com> | 2007-10-16 19:18:30 +0000 |
commit | f3d22cd9944eba42357e8d6a7686372b8b1ac2d5 (patch) | |
tree | 54255447e4d045e353ccc083ea5c986d99fdfd75 /Lib/collections.py | |
parent | 00ca7947a574d9be5c3763a9515c44ba4ca9f965 (diff) | |
download | cpython-f3d22cd9944eba42357e8d6a7686372b8b1ac2d5.tar.gz |
Improve error messages
Diffstat (limited to 'Lib/collections.py')
-rw-r--r-- | Lib/collections.py | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/Lib/collections.py b/Lib/collections.py index 4515759b78..fbc00d1fce 100644 --- a/Lib/collections.py +++ b/Lib/collections.py @@ -32,16 +32,17 @@ def named_tuple(typename, field_names, verbose=False): if isinstance(field_names, basestring): field_names = field_names.replace(',', ' ').split() # names separated by whitespace and/or commas field_names = tuple(field_names) - if not ''.join((typename,) + field_names).replace('_', '').isalnum(): - raise ValueError('Type names and field names can only contain alphanumeric characters and underscores') + for name in (typename,) + field_names: + if not name.replace('_', '').isalnum(): + raise ValueError('Type names and field names can only contain alphanumeric characters and underscores: %r' % name) + if name[0].isdigit(): + 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('__'): - raise ValueError('Field names cannot start and end with double underscores: %s' % name) - if name[:1].isdigit(): - raise ValueError('Field names cannot start with a number: %s' % name) + raise ValueError('Field names cannot start and end with double underscores: %r' % name) if name in seen_names: - raise ValueError('Encountered duplicate field name: %s' % name) + raise ValueError('Encountered duplicate field name: %r' % name) seen_names.add(name) # Create and fill-in the class template |