code: def _is_operation_source(source):
      return source.uri.startswith("operation:")
  
imports: import logging
  import os
  import subprocess
  import time
  from guild import config
  from guild import exit_code
  from guild import log
  from guild import op_dep
  from guild import op_util
  from guild import run
  from guild import util
label_desc: Use image node_id 38 for calling a global function with example usage: _is_operation_source(source) and returns: source