I receive an internal server error "TypeError: valid_month() takes exactly 1 argument (2 given)" when I try and submit this DJango form. It looks to me like I'm only passing one argument to valid_month(), not two. Will you help me understand what I'm doing wrong here? I'm using the google app engine launcher to test this.I receive an internal server error "TypeError:
阅读背景：
Django内部服务器错误(只接受一个参数(给定两个))
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