#14798: pyclbr now raises ImportError instead of KeyError for missing packages

Lib/pyclbr.py

@@ -130,6 +130,8 @@ def _readmodule(module, path, inpackage=None):
         parent = _readmodule(package, path, inpackage)
         if inpackage is not None:
             package = "%s.%s" % (inpackage, package)
+        if not '__path__' in parent:
+            raise ImportError('No package named {}'.format(package))
         return _readmodule(submodule, parent['__path__'], package)
 
     # Search the path for the module

Lib/test/test_pyclbr.py

@@ -167,6 +167,11 @@ class PyclbrTest(TestCase):
         cm('email.parser')
         cm('test.test_pyclbr')
 
+    def test_issue_14798(self):
+        # test ImportError is raised when the first part of a dotted name is
+        # not a package
+        self.assertRaises(ImportError, pyclbr.readmodule_ex, 'asyncore.foo')
+
 
 def test_main():
     run_unittest(PyclbrTest)

Misc/ACKS

@@ -361,6 +361,7 @@ Lars Marius Garshol
 Dan Gass
 Andrew Gaul
 Stephen M. Gava
+Xavier de Gaye
 Harry Henry Gebel
 Marius Gedminas
 Thomas Gellekum

Misc/NEWS

@@ -38,6 +38,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #14798: Fix the functions in pyclbr to raise an ImportError
+  when the first part of a dotted name is not a package. Patch by
+  Xavier de Gaye.
+
 - Issue #12098: multiprocessing on Windows now starts child processes
   using the same sys.flags as the current process.  Initial patch by
   Sergey Mezentsev.