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Expose the namedtuple source with a _source attribute.

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Raymond Hettinger 2011-03-23 12:52:23 -07:00
parent 843a751369
commit 2ebea41d31
3 changed files with 20 additions and 53 deletions
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11
Lib/collections/__init__.py
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@ -332,13 +332,13 @@ def namedtuple(typename, field_names, verbose=False, rename=False):
raise ValueError('Type names and field names cannot be a keyword: %r' % name)
if name[0].isdigit():
raise ValueError('Type names and field names cannot start with a number: %r' % name)
seen_names = set()
seen = set()
for name in field_names:
if name.startswith('_') and not rename:
raise ValueError('Field names cannot start with an underscore: %r' % name)
if name in seen_names:
if name in seen:
raise ValueError('Encountered duplicate field name: %r' % name)
seen_names.add(name)
seen.add(name)
# Fill-in the class template
class_definition = _class_template.format(
@ -350,8 +350,6 @@ def namedtuple(typename, field_names, verbose=False, rename=False):
field_defs = '\n'.join(_field_template.format(index=index, name=name)
for index, name in enumerate(field_names))
)
if verbose:
print(class_definition)
# Execute the class definition string in a temporary namespace and
# support tracing utilities by setting a value for frame.f_globals['__name__']
@ -361,6 +359,9 @@ def namedtuple(typename, field_names, verbose=False, rename=False):
except SyntaxError as e:
raise SyntaxError(e.msg + ':\n\n' + class_definition)
result = namespace[typename]
result._source = class_definition
if verbose:
print(result._source)
# For pickling to work, the __module__ variable needs to be set to the frame
# where the named tuple is created. Bypass this step in enviroments where