[mod_python] Module importing and classes

Hi Graham

The following is the complete code of the 2 files.

WebGUI.py
********************************************************************************
from mod_python import apache
webEdit = apache.import_module("~/test/GUI/Edit/webEdit.py")

WebGUIMessage = "Hello from WebGUI.py"

class WebGUI:
  def __init__(self):
    attribute = 0

def index(req):
  myClassObject = webEdit.WebEdit()
  return myClassObject.myAttribute
********************************************************************************

webEdit.py
********************************************************************************
from mod_python import apache
webGUI = apache.import_module("~/test/GUI/WebGUI.py")

class WebEdit(webGUI.WebGUI):
  def __init__(self):
    self.myAttribute = 1

def index(req):
  return webGUI.__dict__
********************************************************************************

The (more or less complete) error page looks like this:

URI:            '/python/test/GUI/WebGUI.py'
Location:       None
Directory:      'C:/Program Files/Apache Software Foundation/Apache2.2/htdocs/python/'
Filename:       'C:\\Program Files\\Apache Software Foundation\\Apache2.2\\htdocs\\python\\test\\GUI\\WebGUI.py'
PathInfo:       ''

Phase:          'PythonHandler'
Handler:        'mod_python.publisher'

Traceback (most recent call last):

  File "C:\Program Files\Python25\Lib\site-packages\mod_python\importer.py", line 1537, in HandlerDispatch
    default=default_handler, arg=req, silent=hlist.silent)

  File "C:\Program Files\Python25\Lib\site-packages\mod_python\importer.py", line 1229, in _process_target
    result = _execute_target(config, req, object, arg)

  File "C:\Program Files\Python25\Lib\site-packages\mod_python\importer.py", line 1128, in _execute_target
    result = object(arg)

  File "C:\Program Files\Python25\Lib\site-packages\mod_python\publisher.py", line 204, in handler
    module = page_cache[req]

  File "C:\Program Files\Python25\Lib\site-packages\mod_python\importer.py", line 1059, in __getitem__
    return import_module(req.filename)

  File "C:\Program Files\Python25\Lib\site-packages\mod_python\importer.py", line 296, in import_module
    log, import_path)

  File "C:\Program Files\Python25\Lib\site-packages\mod_python\importer.py", line 680, in import_module
    execfile(file, module.__dict__)

  File "C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\python\test\GUI\WebGUI.py", line 6, in <module>
    webEdit = apache.import_module("~/test/GUI/Edit/webEdit.py")

  File "C:\Program Files\Python25\Lib\site-packages\mod_python\importer.py", line 296, in import_module
    log, import_path)

  File "C:\Program Files\Python25\Lib\site-packages\mod_python\importer.py", line 680, in import_module
    execfile(file, module.__dict__)

  File "C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\python\test\GUI\Edit\webEdit.py", line 4, in <module>
    class WebEdit(webGUI.WebGUI):

AttributeError: 'module' object has no attribute 'WebGUI'

If I omit the 'webEdit = apache.import_module("~/test/GUI/Edit/webEdit.py")' inside 'WebGUI.py' as you mentioned I get a:

  File "C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\python\test\GUI\WebGUI.py", line 19, in index
    myClassObject = webEdit.WebEdit()

NameError: global name 'webEdit' is not defined

Error...

And if I omit the 'webGUI = apache.import_module("~/test/GUI/WebGUI.py")' inside 'webEdit.py' I get:

File "C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\python\test\GUI\Edit\webEdit.py", line 4, in <module>
    class WebEdit(webGUI.WebGUI):

NameError: name 'webGUI' is not defined

So that's why I thought I need to have both import statements...


-----Original Message-----
From: Graham Dumpleton [mailto:graham.dumpleton at gmail.com]
Sent: Donnerstag, 27. März 2008 20:52
To: Holzwarth, Dominique (Berne Bauhaus)
Cc: mod_python at modpython.org
Subject: Re: [mod_python] Module importing and classes

Does webGUI.py try and import webEdit and thus you have a circular import?

With PythonDebug On in configuration, what is the import dependency graph information that is included in HTTP error page response after the trace back information?

Graham