Richard Jones wrote:
The import trickery is to allow users to "import pyglet" and then
refer to any sub-module with no further imports; but without requiring
that the "pyglet" module actually import all those sub-modules until
they're needed.
I've developed a scheme for doing this in PyGUI that you
might like to take a look at. It involves replacing the
top-level module with a subclass that does the importing
the first time something from a submodule is referenced.
No proxy objects are used anywhere -- when you ask for
something, you get exactly what you expected.
The relevant code is in the attachment starting with
class AutoloadingModule.
--
Greg
#--------------------------------------------------------------------
#
# PyGUI - Top level package initialisation
#
#--------------------------------------------------------------------
import sys, types
# The first item of each of the following pairs is the name of a module
# to try to import. If the import is successful, the platform-dependent
# directory named by the second item is used.
_versions = [
("objc", "Cocoa"),
("nt", "Win32"),
("gtk", "Gtk"),
]
#
# The environment variable PYGUI_IMPLEMENTATION may be set to the
# name of one of the platform-dependent directories to force that
# implementation to be used. This can be useful if more than one
# PyGUI implementation is usable on your setup.
#
from os import environ as _env
_platdir = _env.get("PYGUI_IMPLEMENTATION")
if not _platdir:
for _testmod, _platdir in _versions:
try:
__import__(_testmod)
break
except ImportError:
continue
else:
raise ImportError("Unable to find an implementation of PyGUI
for this installation")
if _env.get("PYGUI_IMPLEMENTATION_DEBUG"):
print "PyGUI: Using implementation:", _platdir
#
# Append the chosen platform-dependent directory to the search
# path for submodules of this package.
#
from os.path import join as _join
_here = __path__[0]
__path__.append(_join(_here, _platdir))
__path__.append(_join(_here, "Generic"))
#
# Autoloading machinery. Arranges things so that referring to
# an undefined name in the GUI module causes an attempt to
# import it from the appropriate submodule.
#
class AutoloadingModule(types.ModuleType):
def __getattr__(self, name):
#print "AutoloadingModule.__getattr__", repr(name)
modname = __automap__.get(name)
if modname == "*": # is a submodule
raise AttributeError
try:
if not modname:
raise ImportError("No autoload mapping for name
%s in module %s" %
(name, self.__name__))
#print "AutoloadingModule: Attempting to import",
repr(modname)
module = __import__(modname, self.__dict__, locals(),
[name])
#print "AutoloadingModule: Imported", module
attr = getattr(module, name)
setattr(self, name, attr)
return attr
except:
import os, sys, traceback
# Exception sometimes gets swallowed here, so report
it ourselves.
#print "AutoloadingModule.__getattr__:", sys.exc_info()
###
traceback.print_stack()
print >>sys.stderr, "Failed to import %r from %s" %
(name, modname)
traceback.print_exc()
os._exit(1)
__automap__ = {}
#
# The following function declares a list of names to be autoloaded
# from a specified module.
#
def autoload(modname, *args):
for namestr in args:
names = namestr.split(",")
for name in names:
__automap__[name.strip()] = modname
def submodule(modname):
__automap__[modname] = "*"
#
# Now import or autoload all the stuff to be made public.
#
from Version import version
autoload("Actions", "Action")
autoload("AlertFunctions",
"alert, alert2, alert3, stop_alert, note_alert, confirm, ask",
"confirm_or_cancel, ask_or_cancel")
autoload("Applications", "Application")
autoload("Buttons", "Button")
autoload("Canvases", "Canvas")
autoload("CheckBoxes", "CheckBox")
autoload("Colors", "Color, rgb")
autoload("Components", "Component")
autoload("Cursors", "Cursor")
autoload("Dialogs", "Dialog")
autoload("Documents", "Document")
autoload("DrawableContainers", "DrawableContainer")
autoload("Events", "Event")
autoload("Exceptions", "Cancel, ResourceNotFoundError, ApplicationError")
autoload("FileDialogs",
"request_old_file, request_new_file",
"request_old_files, request_old_directory",
"request_old_directories, request_new_directory")
autoload("Files", "FileRef, DirRef, FileType")
autoload("Fonts", "Font")
autoload("Frames", "Frame")
autoload("Globals", "application, run")
autoload("ImageBases", "ImageBase")
autoload("Images", "Image")
autoload("Labels", "Label")
autoload("Menus", "Menu, MenuItem")
autoload("MenuLists", "MenuList")
autoload("MessageHandlers", "MessageHandler")
autoload("ModalDialogs", "ModalDialog")
autoload("Models", "Model")
autoload("Printing", "PageSetup, present_page_setup_dialog")
# from Pictures import Picture
autoload("Pixmaps", "Pixmap")
autoload("Properties import Properties, overridable_property")
autoload("RadioButtons", "RadioButton")
autoload("RadioGroups", "RadioGroup")
autoload("Resources", "resource_path, find_resource")
autoload("Layout", "Row,Column,Grid")
autoload("ScrollableViews", "ScrollableView")
autoload("Sliders", "Slider")
autoload("StdButtons", "DefaultButton, CancelButton")
submodule("StdColors")
submodule("StdCursors")
submodule("StdFonts")
submodule("StdMenus")
autoload("Tasks", "Task")
autoload("TextFields", "TextField")
autoload("TextEditors", "TextEditor")
# ##from TextModels import TextModel
# ##from TextViews import TextView
autoload("ViewBases", "ViewBase")
autoload("Views", "View")
autoload("Windows", "Window")
from Resources import _add_file_path, _add_module_path
import __main__
_add_file_path(__file__)
_add_module_path(__main__)
_add_module_path(__main__, 1)
#print "GUI: resource_path =", resource_path ###
import GUI
module = AutoloadingModule(GUI.__name__)
module.__dict__.update(GUI.__dict__)
sys.modules["GUI"] = module
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