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"""Clear ``sys.modules`` of specific types of modules if one is stale."""

__docformat__ = "restructuredtext"

_lastModuleUpdate = time.time()
def clearModules():
    """Clear ``sys.modules`` of specific types of modules if one is stale.

    See ``properties.CLEAR_MODULES``.

    I took this method out of the ``InternalLibrary`` class so that you can
    call it *really* early, even before you create a ``Context`` to pass to

    global _lastModuleUpdate
    if not properties.CLEAR_MODULES:
    deleteTheseTypes = properties.CLEAR_MODULES
    if not isinstance(deleteTheseTypes, list):
        # Update Seamstress Exchange's properties file if you change this.
        deleteTheseTypes = ["aquarium.layout","aquarium.navigation",
                            "aquarium.screen", "aquarium.widget"]
    deleteThese = [
        for moduleType in deleteTheseTypes
            for moduleName in sys.modules.keys()
                if (moduleName == moduleType or 
                    moduleName.startswith(moduleType + "."))
    for i in deleteThese:
            file = sys.modules[i].__file__
        except AttributeError:
        if file.endswith(".pyc") and os.path.exists(file[:-1]):
            file = file[:-1]
        ST_MTIME = 8
        if (_lastModuleUpdate < os.stat(file)[ST_MTIME]):
            staleModules = True
        staleModules = False
    if staleModules: 
        for i in deleteThese:           # You can't modify a dictionary 
            del sys.modules[i]          # during an iteration.
    _lastModuleUpdate = time.time()


  • revision 3 (18 years ago)
  • previous revisions are not available