f5 sdk can't load pool objects after create pool.

from f5.bigip import ManagementRoot
from f5.bigip.contexts import TransactionContextManager
import threading
import time
 
 
def create_pool(name):
    print time.ctime() + "create pool name: %s" % name
    tx = mgmt.tm.transactions.transaction
    with TransactionContextManager(tx) as api:
        api.tm.ltm.pools.pool.create(name=name)
 
 
def delete_pool(name):
    print time.ctime() + "delete pool name: %s" % name
    tx = mgmt.tm.transactions.transaction
    with TransactionContextManager(tx) as api:
        p = api.tm.ltm.pools.pool.load(name=name)
        p.delete()
 
 
def save_config():
    print time.ctime() + "save sys config"
    tx = mgmt.tm.transactions.transaction
    with TransactionContextManager(tx) as api:
        api.tm.util.bash.exec_cmd(
            command='run',
            utilCmdArgs="-c 'tmsh save sys config'"
        )
 
 
if __name__ == "__main__":
 
    for x in range(1, 50):
        mgmt = ManagementRoot('10.5.10.23', 'admin', 'XXXXX', token=True)
        name = 'pool' + str(x)
        # x = threading.Thread(target=create_pool, args=(name,))
        # x.start()
        # # time.sleep(1)
        # x = threading.Thread(target=delete_pool, args=(name,))
        # x.start()
        # time.sleep(1)
        # x = threading.Thread(target=save_config)
        # x.start()
        # time.sleep(1)
        create_pool(name)
        delete_pool(name)
        save_config()
 
 

Tested this code,​ it works.