class_docstr: A 'pollable' wrapper allowing analysis of the `poll()` calls.
class_docstr_tok: ["A","'pollable","'","wrapper","allowing","analysis","of","the","`","poll","(",")","`","calls","."]
code: def poll(self):
      rv = self.pollable.poll()
      self.polls.append(rv)
      return rv
  
imports: import gc
  import time
  import unittest
  import warnings
  import psycopg2
  import psycopg2.errors
  from psycopg2 import extensions
  from .testutils import ConnectingTestCase, StringIO, skip_before_postgres, skip_if_crdb, crdb_version, slow
label_desc: Use image node_id 3 for calling the PollableStub obj's underlying member method code with example usage: obj.poll() and returns: rv