code: def _legal_env(env):
      return {name: str(val) for name, val in env.items() if val}
  
imports: import logging
  import os
  import subprocess
  import sys
  from guild import config
  from guild import file_util
  from guild import log
  from guild import remote
  from guild import util
  from guild import var
label_desc: Use image node_id 13 for calling a global function with example usage: _legal_env(env) and returns: unknown