Expose the namedtuple source with a _source attribute.
diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py
index b75b4d7..652e4f1 100644
--- a/Lib/collections/__init__.py
+++ b/Lib/collections/__init__.py
@@ -332,13 +332,13 @@
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 @@
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 @@
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
diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index d71fb01..cdc7db9 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -127,6 +127,7 @@
self.assertEqual(Point.__module__, __name__)
self.assertEqual(Point.__getitem__, tuple.__getitem__)
self.assertEqual(Point._fields, ('x', 'y'))
+ self.assertIn('class Point(tuple)', Point._source)
self.assertRaises(ValueError, namedtuple, 'abc%', 'efg ghi') # type has non-alpha char
self.assertRaises(ValueError, namedtuple, 'class', 'efg ghi') # type has keyword