code: def initread(self, idfname):
          
          with open(idfname, 'r') as _:
              # raise nonexistent file error early if idfname doesn't exist
              pass
          iddfhandle = StringIO(iddcurrent.iddtxt)
          if self.getiddname() == None:
              self.setiddname(iddfhandle)
          self.idfname = idfname
          self.read()
docs: Use the current IDD and read an IDF from file. If the IDD has not yet
          been initialised then this is done first.
  
          Parameters
          ----------
          idf_name : str
              Path to an IDF file.