Issue #13293: Better error message when trying to marshal bytes using xmlrpc.client.

Lib/xmlrpc/client.py

@@ -503,9 +503,7 @@ class Marshaller:
             f = self.dispatch[type(value)]
         except KeyError:
             # check if this object can be marshalled as a structure
-            try:
+            if not hasattr(value, '__dict__'):
-                value.__dict__
-            except:
                 raise TypeError("cannot marshal %s objects" % type(value))
             # check if this class is a sub-class of a basic type,
             # because we don't know how to marshal these types
@@ -553,12 +551,6 @@ class Marshaller:
         write("</double></value>\n")
     dispatch[float] = dump_double
 
-    def dump_string(self, value, write, escape=escape):
-        write("<value><string>")
-        write(escape(value))
-        write("</string></value>\n")
-    dispatch[bytes] = dump_string
-
     def dump_unicode(self, value, write, escape=escape):
         write("<value><string>")
         write(escape(value))

Misc/NEWS

@@ -63,6 +63,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #13293: Better error message when trying to marshal bytes using
+  xmlrpc.client.
+
 - Issue #13291: NameError in xmlrpc package.
 
 - Issue #13258: Use callable() built-in in the standard library.