Issue 21832: Require named tuple inputs to be exact strings

diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py
index d6deb6a7b2621ae4e1fd07b46749fa54eea18822..d993fe0ce7315e787e7058ea83e6e3949b8bff19 100644 (file)
--- a/Lib/collections/__init__.py
+++ b/Lib/collections/__init__.py
@@ -323,6 +323,7 @@ def namedtuple(typename, field_names, verbose=False, rename=False):
     if isinstance(field_names, str):
         field_names = field_names.replace(',', ' ').split()
     field_names = list(map(str, field_names))
+    typename = str(typename)
     if rename:
         seen = set()
         for index, name in enumerate(field_names):
@@ -333,6 +334,8 @@ def namedtuple(typename, field_names, verbose=False, rename=False):
                 field_names[index] = '_%d' % index
             seen.add(name)
     for name in [typename] + field_names:
+        if type(name) != str:
+            raise TypeError('Type names and field names must be strings')
         if not name.isidentifier():
             raise ValueError('Type names and field names must be valid '
                              'identifiers: %r' % name)