code: def worker():
      while True:
          conn = engine.connect()
          try:
              conn.begin()
              for i in range(5):
                  conn.exec_driver_sql("SELECT 1+1")
                  gevent.sleep(random.random() * 1.01)
  
          except Exception:
              # traceback.print_exc()
              sys.stderr.write("X")
          else:
              conn.close()
              sys.stderr.write(".")
  
file_path: sqlalchemy/test/perf/invalidate_stresstest.py
imports: import logging
  import random
  import sys
  import gevent.monkey
  from sqlalchemy import create_engine
  from sqlalchemy import event
label_desc: Use image node_id 2 for calling a global function with example usage: worker() without return types