application.py 文件源码

def __init__(self, mapping=(), fvars={}, autoreload=None):
        if autoreload is None:
            autoreload = web.config.get('debug', False)
        self.init_mapping(mapping)
        self.fvars = fvars
        self.processors = []

        self.add_processor(loadhook(self._load))
        self.add_processor(unloadhook(self._unload))

        if autoreload:
            def main_module_name():
                mod = sys.modules['__main__']
                file = getattr(mod, '__file__', None) # make sure this works even from python interpreter
                return file and os.path.splitext(os.path.basename(file))[0]

            def modname(fvars):
                """find name of the module name from fvars."""
                file, name = fvars.get('__file__'), fvars.get('__name__')
                if file is None or name is None:
                    return None

                if name == '__main__':
                    # Since the __main__ module can't be reloaded, the module has 
                    # to be imported using its file name.                    
                    name = main_module_name()
                return name

            mapping_name = utils.dictfind(fvars, mapping)
            module_name = modname(fvars)

            def reload_mapping():
                """loadhook to reload mapping and fvars."""
                mod = __import__(module_name, None, None, [''])
                mapping = getattr(mod, mapping_name, None)
                if mapping:
                    self.fvars = mod.__dict__
                    self.init_mapping(mapping)

            self.add_processor(loadhook(Reloader()))
            if mapping_name and module_name:
                self.add_processor(loadhook(reload_mapping))

            # load __main__ module usings its filename, so that it can be reloaded.
            if main_module_name() and '__main__' in sys.argv:
                try:
                    __import__(main_module_name())
                except ImportError:
                    pass