def _transaction_func(entering, exiting, using):
    # Note that although the first argument is *called* `using`, it
    # may actually be a function; @autocommit and @autocommit('foo')
    # are both allowed forms.
    if using is None:
        using = DEFAULT_DB_ALIAS
    if callable(using):
        return Transaction(entering, exiting, DEFAULT_DB_ALIAS)(using)
    return Transaction(entering, exiting, using)
True if the token text is all alphabetic.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/db/transaction.py/_transaction_func--crossover with--dataset/ETHPy150Open reefeed/wanish/wanish/tokenizers.py/PunktToken.is_alpha