<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def prepare_query(query):
 """ Prepare a query object for the RAPI. RAPI has lots of curious rules for coercing values. This function operates on dicts in-place and has no return value. @type query: dict @param query: Query arguments """


    for name in query:
        value = query[name]

        # None is sent as an empty string.
        if value is None:
            query[name] = ""

        # Booleans are sent as 0 or 1.
        elif isinstance(value, bool):
            query[name] = int(value)

        # XXX shouldn't this just check for basestring instead?
        elif isinstance(value, dict):
            raise ValueError("Invalid query data type %r" %
                             type(value).__name__)