class_docstr: Supports download and file check for dropbox links
class_docstr_tok: ["Supports","download","and","file","check","for","dropbox","links"]
code: def _isfile(self, path):
      return path in self.cache_map
  
imports: from iopath.common.file_io import HTTPURLHandler
  from iopath.common.file_io import PathManager
label_desc: Use image node_id 2 for calling the DropboxHandler obj's underlying member method code with example usage: obj._isfile(path) and returns: unknown