将json.load的unicode转化为encode

json.load(file)读取的文件内容为Unicode，需要将该数据转为encode

def byteify(input):
    """把Unicode转换为encode"""
    if isinstance(input, dict):
        return {byteify(key):byteify(value) for key,value in input.iteritems()}
        print("dic...dict")
    elif isinstance(input, list):
        return [byteify(element) for element in input]
        print("list...list...")
    elif isinstance(input, unicode):
        return input.encode('utf-8')
        print("unicode....unicode")
    else:
        return input