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Minor improvement to the namedtuple implementation (GH-20741)

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* Cleaner way to build the arg list with a trailing comma when required

* Fix appearance of __new__ in help()
This commit is contained in:
Raymond Hettinger 2020-06-08 12:38:41 -07:00 committed by GitHub
parent 3ab3475c42
commit 0a40849eb9
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 1 deletions
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5
Lib/collections/__init__.py
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@ -399,7 +399,9 @@ def namedtuple(typename, field_names, *, rename=False, defaults=None, module=Non
# Variables used in the methods and docstrings
field_names = tuple(map(_sys.intern, field_names))
num_fields = len(field_names)
arg_list = repr(field_names).replace("'", "")[1:-1]
arg_list = ', '.join(field_names)
if num_fields == 1:
arg_list += ','
repr_fmt = '(' + ', '.join(f'{name}=%r' for name in field_names) + ')'
tuple_new = tuple.__new__
_dict, _tuple, _len, _map, _zip = dict, tuple, len, map, zip
@ -410,6 +412,7 @@ def namedtuple(typename, field_names, *, rename=False, defaults=None, module=Non
namespace = {'_tuple_new': tuple_new, '__builtins__': None,
'__name__': f'namedtuple_{typename}'}
__new__ = eval(s, namespace)
__new__.__name__ = '__new__'
__new__.__doc__ = f'Create new instance of {typename}({arg_list})'
if defaults is not None:
__new__.__defaults__ = defaults