conditionally async tasklet decorator

gistfile1.py

from google.appengine.ext import ndb

def tasklet(func):
    """Tasklet decorator that lets the caller specify either async or sync
    behavior at runtime.

    If make_sync is False (the default), the tasklet returns a future and
    can be used in asynchronous control flow from within other tasklets
    (like ndb.tasklet). If make_sync is True, the tasklet will wait for its
    results and return them, allowing you to call the tasklet from synchronous
    code (like ndb.synctasklet).
    """
    @ndb.utils.wrapping(func)
    def tasklet_wrapper(*args, **kwds):
        arg_name = "make_sync"
        sync_by_default = False
        make_sync = kwds.get(arg_name, sync_by_default)
        if make_sync:
            taskletfunc = ndb.synctasklet(func)
        else:
            taskletfunc = ndb.tasklet(func)
        if arg_name in kwds:
            del kwds[arg_name]
        return taskletfunc(*args, **kwds)
    return tasklet_wrapper