lazyasd.py 文件源码

def run(self):
        # wait for other modules to stop being imported
        # We assume that module loading is finished when sys.modules doesn't
        # get longer in 5 consecutive 1ms waiting steps
        counter = 0
        last = -1
        while counter < 5:
            new = len(sys.modules)
            if new == last:
                counter += 1
            else:
                last = new
                counter = 0
            time.sleep(0.001)
        # now import module properly
        modname = importlib.util.resolve_name(self.name, self.package)
        if isinstance(sys.modules[modname], BackgroundModuleProxy):
            del sys.modules[modname]
        mod = importlib.import_module(self.name, package=self.package)
        for targname, varname in self.replacements.items():
            if targname in sys.modules:
                targmod = sys.modules[targname]
                setattr(targmod, varname, mod)