human
I wrote the below code

    import time
    import logging
    from google.appengine.api import apiproxy_stub_map
    from google.appengine.runtime import apiproxy_errors
    from google.appengine.datastore import datastore_pb
    attempts = float(attempts)
    interval = float(interval)
    exponent = float(exponent)
    wrapped = apiproxy_stub_map.MakeSyncCall
    errors = {datastore_pb.Error.TIMEOUT: 'Timeout', datastore_pb.Error.CONCURRENT_TRANSACTION: 'TransactionFailedError'}
    def wrapper(*args, **kwargs):
        count = 0.0
        while True:
            try:
                return wrapped(*args, **kwargs)
            except apiproxy_errors.ApplicationError as err:
                errno = err.application_error
                if (errno not in errors):
                    raise
                sleep = ((exponent ** count) * interval)
                count += 1.0
                if (count > attempts):
                    raise
                msg = 'Datastore    %s:    retry    #%d    in    %s    seconds.\n%s'
                vals = ''
                if (count == 1.0):
                    vals = '\n'.join([str(a) for a in args])
                logging.warning((msg % (errors[errno], count, sleep, vals)))
                time.sleep(sleep)
    setattr(wrapper, '_autoretry_datastore_timeouts', False)
    if getattr(wrapped, '_autoretry_datastore_timeouts', True):
        apiproxy_stub_map.MakeSyncCall = wrapper

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def autoretry_datastore_timeouts(attempts=5.0, interval=0.1, exponent=2.0):