py3: review linecache patches

 - Products.PythonScripts now has a __loader__
 - do not use < > as filename for component on py3, this makes linecache
 work out of the box. On py2 I think it was causing errors trying to
 actually open the file, but this does not seem needed on py3 and
 simplifies everything

product/ERP5/tests/testERP5Callable.py

@@ -26,6 +26,7 @@
 #
 ##############################################################################
 
+import six
 import sys
 import traceback
 
@@ -84,6 +85,11 @@ class TestERP5PythonScript(ERP5TypeTestCase):
     self.script.setBody('return "Hello " + who')
     self.assertEqual(self.script("world"), "Hello world")
 
+    if six.PY2:
+      filename = 'ERP5 Python Script'
+    else:
+      filename = 'ERP5 Python Script:%s' % self.script.getPath()
+
     try:
       self.script(123)
     except TypeError:
@@ -91,8 +97,8 @@ class TestERP5PythonScript(ERP5TypeTestCase):
       # python script code is visible in traceback
       self.assertEqual(
         traceback.format_tb(tb)[-1],
-        '  File "ERP5 Python Script", line 1, in %s\n'
-        '    return "Hello " + who\n' % self.id()
+        '  File "%s", line 1, in %s\n'
+        '    return "Hello " + who\n' % (filename, self.id())
       )
     else:
       self.fail('Exception not raised')
@@ -126,6 +132,11 @@ class TestERP5WorkflowScript(ERP5TypeTestCase):
     self.script.setBody('return "Hello " + state_change')
     self.assertEqual(self.script("world"), "Hello world")
 
+    if six.PY2:
+      filename = 'ERP5 Workflow Script'
+    else:
+      filename = 'ERP5 Workflow Script:%s' % self.script.getPath()
+
     try:
       self.script(123)
     except TypeError:
@@ -133,8 +144,8 @@ class TestERP5WorkflowScript(ERP5TypeTestCase):
       # python script code is visible in traceback
       self.assertEqual(
         traceback.format_tb(tb)[-1],
-        '  File "ERP5 Workflow Script", line 1, in script_test_script\n'
-        '    return "Hello " + state_change\n'
+        ('  File "%s", line 1, in script_test_script\n'
+        '    return "Hello " + state_change\n') % filename
       )
     else:
       self.fail('Exception not raised')

product/ERP5Type/dynamic/component_package.py

@@ -332,7 +332,10 @@ class ComponentDynamicPackage(ModuleType):
 
     component = getattr(site.portal_components, component_id)
     relative_url = component.getRelativeUrl()
+    if six.PY2:
       module_file = '<' + relative_url + '>'
+    else:
+      module_file = 'erp5://' + relative_url
 
     module_fullname = '%s.%s_version.%s' % (self._namespace, version, name)
     module = ModuleType(module_fullname, component.getDescription())

product/ERP5Type/patches/python.py

@@ -155,9 +155,10 @@ def patch_linecache():
             data = get_source(name)
           except (ImportError, AttributeError):
             pass
-
         return data.splitlines(True) if data is not None else ()
 
+      if module_globals is not None:
+        # in-ZODB python scripts
         if basename(filename) in ('Script (Python)', 'ERP5 Python Script', 'ERP5 Workflow Script'):
           try:
             script = module_globals['script']
@@ -166,6 +167,8 @@ def patch_linecache():
           except Exception:
             pass
           return ()
+
+      # TALES expressions
       x = expr_search(filename)
       if x:
         return x.groups()
@@ -173,4 +176,5 @@ def patch_linecache():
 
   linecache.getlines = getlines
 
-patch_linecache()
+if sys.version_info[:3] < (3, ):
+  patch_linecache()

product/ERP5Type/tests/testDynamicClassGeneration.py

@@ -3401,13 +3401,18 @@ break_at_import()
       return self._component_tool.readTestOutput()
 
     output = runLiveTest('testRunLiveTestImportError')
+    relative_url = 'portal_components/test.erp5.testRunLiveTestImportError'
+    if six.PY2:
+      module_file = '<' + relative_url + '>'
+    else:
+      module_file = 'erp5://' + relative_url
     self.assertIn('''
-  File "<portal_components/test.erp5.testRunLiveTestImportError>", line 4, in <module>
+  File "%(module_file)s", line 4, in <module>
     break_at_import()
-  File "<portal_components/test.erp5.testRunLiveTestImportError>", line 3, in break_at_import
+  File "%(module_file)s", line 3, in break_at_import
     import non.existing.module # pylint:disable=import-error
 ImportError: No module named non.existing.module
-''', output)
+''' % dict(module_file=module_file), output)
 
     output = runLiveTest('testDoesNotExist_import_error_because_module_does_not_exist')
     self.assertIn(