Changed comment and removed non-existing nonlocal_hclass import

share/lib/python/neuron/__init__.py

@@ -235,14 +235,14 @@ def test_rxd(exitOnError=True):
 
 import sys, types
 
+# Load the `hclass` factory for the correct Python version 2/3 and prevent the
+# incorrect module source code from being opened by creating an empty module.
 if sys.version_info[0] == 2:
-  from neuron.hclass2 import hclass
-  # Add hclass3, the py3 variant of hclass2 to the module cache so that hclass3.py
-  # is never read by the Python 2 interpreter and can contain Python 3 only syntax.
   sys.modules["neuron.hclass3"] = types.ModuleType("neuron.hclass3")
+  from neuron.hclass2 import hclass
 else:
-  from neuron.hclass3 import hclass, nonlocal_hclass
   sys.modules["neuron.hclass2"] = types.ModuleType("neuron.hclass2")
+  from neuron.hclass3 import hclass
 
 # global list of paths already loaded by load_mechanisms
 nrn_dll_loaded = []