import NoReverseMatch, reverse
2.TypeError: __init__() missing 1 required positional argument: 'on_delete...on_delete=models.CASCADE
3.TypeError: __init__() takes 1 positional argument but 6 were given
解决方法:将...__init__(self, required, widget, label, initial, help_text, *args, **kwargs)
改成
forms.Field....= models.CharField('性别',max_length=30,choices=(('male','男'),('female','女')),default='female')
可以看到设置的字符长度是...直接django2.0版本的