code: def get_uid(base=None):
      if base:
          str_base = base
      else:
          str_base = ""
      Env._counter += 1
      return f"__uid_{str_base}{Env._counter}"
  
imports: from typing import Optional, Union
  import sys
  import re
  from hailtop.config import ConfigVariable, configuration_of
label_desc: Use image node_id 1 for calling the Env obj's underlying member method code with example usage: obj.get_uid(base) and returns: str, str_base, Env