diff -ur astropy-5.2/astropy/utils/parsing.py astropy-5.2.ply/astropy/utils/parsing.py
--- astropy-5.2/astropy/utils/parsing.py	2022-12-12 11:57:50.000000000 +0100
+++ astropy-5.2.ply/astropy/utils/parsing.py	2023-01-07 00:46:01.246483036 +0100
@@ -82,7 +82,7 @@
     reflags : int
         Passed to ``ply.lex``.
     """
-    from astropy.extern.ply import lex
+    from ply import lex
 
     caller_file = lex.get_caller_module_dict(2)["__file__"]
     lextab_filename = os.path.join(os.path.dirname(caller_file), lextab + ".py")
@@ -138,7 +138,7 @@
         the output file. This is inserted into a comment in the generated
         file.
     """
-    from astropy.extern.ply import yacc
+    from ply import yacc
 
     caller_file = yacc.get_caller_module_dict(2)["__file__"]
     tab_filename = os.path.join(os.path.dirname(caller_file), tabmodule + ".py")