小编Pav*_*T S的帖子

我有一个模型表单，我想在其中将 required 属性设置为 True 以进行电子邮件验证

场地：-email

class RegisterMyBuisinessForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        self.helper = FormHelper()
        self.helper.form_method = 'post'
        self.helper.form_action = '/registermybuisness/'
        Field('email', type='email')
        self.helper.add_input(Submit('submit', 'Submit',css_class="btn c-theme-btn c-btn-square c-btn-bold c-btn-uppercase"))
        super(RegisterMyBuisinessForm, self).__init__(*args, **kwargs)
    class Meta:
        model = RegistermyBusiness
        fields = ['name','email', 'org_name', 'contact','business_description','store_address','message','store_landmark','business_type','city']        

我试过

self.fields['email'].required=True 

这导致类 RegisterMyBuisinessForm 没有字段错误

我有这样的清单

li = [
    {1: {'amount': 255, 'date': '25-02-2017'}},
    {2: {'amount': 25, 'date': '2-02-2017'}},
    {3: {'amount': 38, 'date': '20-02-2017'}},
]

我试图基于的升序和降序对数据进行排序'amount'.

我尝试了以下但我无法得到我想要的结果:

import operator
li.sort(key=operator.itemgetter('amount'))

和

from operator import itemgetter
newlist = sorted(li, key=itemgetter('amount'))

两者都引发异常KeyError: 'amount'.