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Improve error messages

This commit is contained in:
Raymond Hettinger 2007-10-16 19:18:30 +00:00
parent 9fc1b96a19
commit 050afbf214
1 changed files with 7 additions and 6 deletions
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13
Lib/collections.py
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@ -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