Closes issue #18598: Have the exception message for

importlib.import_module() include the name of the module when the
'package' argument is missing but needed.

Lib/importlib/__init__.py

@@ -85,7 +85,9 @@ def import_module(name, package=None):
     level = 0
     if name.startswith('.'):
         if not package:
-            raise TypeError("relative imports require the 'package' argument")
+            msg = ("the 'package' argument is required to perform a relative "
+                   "import for {!r}")
+            raise TypeError(msg.format(name))
         for character in name:
             if character != '.':
                 break

Misc/NEWS

@@ -24,6 +24,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #18598: Tweak exception message for importlib.import_module() to
+  include the module name when a key argument is missing.
+
 - Issue #18676: Change 'positive' to 'non-negative' in queue.py put and get
   docstrings and ValueError messages. Patch by Zhongyue Luo