Fix UnicodeDecodeError and check return code #5
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在获取prepayId的时候,如果参数中含中文会出现UnicodeDecodeError错误,原因是Python 2.x中,字符串的默认编码是ascii码,format()函数碰到Unicode会出错。另外,getPrepayId最好检查下return code,否则会导致后面的程序出错。