http.py 文件源码

def prepare(query, connection=None, external=None):
    connection = merge(_default, connection or {})
    database = escape(connection['database'])
    query = query.format(db=database)
    params = {'query': query,
              'user': connection['user'],
              'password': connection['password']}
    params = valfilter(lambda x: x, params)

    files = {}
    external = external or {}
    for name, (structure, serialized) in external.items():
        params['{}_format'.format(name)] = 'CSV'
        params['{}_structure'.format(name)] = structure
        files[name] = serialized

    host = connection['host']

    return host, params, files