Replace e.message with str(e) for Python 3 compatibility (#4416)

certbot/display/ops.py

@@ -192,12 +192,7 @@ def _choose_names_manually(prompt_prefix=""):
             try:
                 domain_list[i] = util.enforce_domain_sanity(domain)
             except errors.ConfigurationError as e:
-                try:  # Python 2
-                    # pylint: disable=no-member
-                    err_msg = e.message.encode('utf-8')
-                except AttributeError:
-                    err_msg = str(e)
-                invalid_domains[domain] = err_msg
+                invalid_domains[domain] = str(e)
 
         if len(invalid_domains):
             retry_message = (

certbot/main.py

@@ -571,7 +571,7 @@ def revoke(config, unused_plugins):  # TODO: coop with renewal config
     try:
         acme.revoke(jose.ComparableX509(cert), config.reason)
     except acme_errors.ClientError as e:
-        return e.message
+        return str(e)
 
     display_ops.success_revocation(config.cert_path[0])
 
@@ -583,7 +583,7 @@ def run(config, plugins):  # pylint: disable=too-many-branches,too-many-locals
     try:
         installer, authenticator = plug_sel.choose_configurator_plugins(config, plugins, "run")
     except errors.PluginSelectionError as e:
-        return e.message
+        return str(e)
 
     # TODO: Handle errors from _init_le_client?
     le_client = _init_le_client(config, authenticator, installer)

certbot/renewal.py

@@ -79,7 +79,7 @@ def _reconstitute(config, full_path):
     except (ValueError, errors.Error) as error:
         logger.warning(
             "An error occurred while parsing %s. The error was %s. "
-            "Skipping the file.", full_path, error.message)
+            "Skipping the file.", full_path, str(error))
         logger.debug("Traceback was:\n%s", traceback.format_exc())
         return None