code: def _exec_mod_name(package):
      if package:
          return f"{package}.__main__"
      return "__main__"
  
imports: import argparse
  import json
  import logging
  import sys
  from guild import entry_point_util
  from guild import flag_util
  from guild import log
  from guild import python_util
  from guild import util
label_desc: Use image node_id 21 for calling a global function with example usage: _exec_mod_name(package) and returns: str, package, str