按照路径加载类

scrapy.utils.misc.load_object

  1. from importlib import import_module
  3. def load_object(path):
  4.     """Load an object given its absolute object path, and return it.
  6.     object can be the import path of a class, function, variable or an
  7.     instance, e.g. 'scrapy.downloadermiddlewares.redirect.RedirectMiddleware'
  8.     """
  10.     try:
  11.         dot = path.rindex('.')
  12.     except ValueError:
  13.         raise ValueError("Error loading object '%s': not a full path" % path)
  15.     module, name = path[:dot], path[dot + 1:]
  16.     mod = import_module(module)
  18.     try:
  19.         obj = getattr(mod, name)
  20.     except AttributeError:
  21.         raise NameError("Module '%s' doesn't define any object named '%s'" % (module, name))
  23.     return obj

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