code: def _valid_email(s):
      try:
          m = re.match(r".+?@.+", s)
      except TypeError:
          return False
      else:
          return bool(m)
  
file_path: guildai/guild/commands/package_impl.py
imports: import re
  import os
  from guild import cli
  from guild import cmd_impl_support
  from guild import config
  from guild import guildfile
  from guild import package
label_desc: Use image node_id 5 for calling a global function with example usage: _valid_email(s) and returns: bool, False