@utils.positional(1)
def transaction_async(callback, **ctx_options):
 from . import tasklets
 return tasklets.get_context().transaction(callback, **ctx_options)

@ utils . positional ( 1 ) def transaction_async ( callback , ** ctx_options ) : from . import tasklets return tasklets . get_context ( ) . transaction ( callback , ** ctx_options )
run a callback in a transaction .