code: def hc() -> "hail.context.HailContext":
      if not Env._hc:
          sys.stderr.write(
              "Initializing Hail with default parameters...\n"
          )
          sys.stderr.flush()
          from ..context import init
  
          init()
  
      assert Env._hc is not None
      return Env._hc
  
imports: from typing import Optional, Union
  import sys
  import re
  from hailtop.config import ConfigVariable, configuration_of
label_desc: Use image node_id 4 for calling the Env obj's underlying member method code with example usage: obj.hc() and returns: Env