Issue #11186: pydoc ignores a module if its name contains a surrogate character

in the index of modules.

Lib/pydoc.py

@@ -952,6 +952,9 @@ class HTMLDoc(Doc):
         modpkgs = []
         if shadowed is None: shadowed = {}
         for importer, name, ispkg in pkgutil.iter_modules([dir]):
+            if any((0xD800 <= ord(ch) <= 0xDFFF) for ch in name):
+                # ignore a module if its name contains a surrogate character
+                continue
             modpkgs.append((name, '', ispkg, name in shadowed))
             shadowed[name] = 1
 

Misc/NEWS

@@ -103,6 +103,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #11186: pydoc ignores a module if its name contains a surrogate
+  character in the index of modules.
+
 - Issue #11815: Use a light-weight SimpleQueue for the result queue in
   concurrent.futures.ProcessPoolExecutor.