From 3cfe5b7b8fb3a0396e62800f3873d9b1f70da1c2 Mon Sep 17 00:00:00 2001 From: Raymond Hettinger Date: Mon, 25 May 2020 21:39:00 -0700 Subject: Simplify creation of the __new__ method in namedtuple() (GH-20361) --- Lib/collections/__init__.py | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py index c4bff59..011a0c1 100644 --- a/Lib/collections/__init__.py +++ b/Lib/collections/__init__.py @@ -406,11 +406,9 @@ def namedtuple(typename, field_names, *, rename=False, defaults=None, module=Non # Create all the named tuple methods to be added to the class namespace - s = f'def __new__(_cls, {arg_list}): return _tuple_new(_cls, ({arg_list}))' + s = f'lambda _cls, {arg_list}: _tuple_new(_cls, ({arg_list}))' namespace = {'_tuple_new': tuple_new, '__name__': f'namedtuple_{typename}'} - # Note: exec() has the side-effect of interning the field names - exec(s, namespace) - __new__ = namespace['__new__'] + __new__ = eval(s, namespace) __new__.__doc__ = f'Create new instance of {typename}({arg_list})' if defaults is not None: __new__.__defaults__ = defaults -- cgit v0.12