关于#python#的问题：django.utils.datastructures.MultiValueDictKeyError: 'city'

1.前端

<script>
    var datasss ;
    function gof(){
        $.ajax({
            url: 'data',
            type: "POST",
            dataType: "json",
            data: {
                city: document.getElementById("predict_City").value,
                type: document.getElementById("predict_Type").value,
                day: document.getElementById("predict_Day").value
            },
            success: function (data) {
                datasss = data;
                // alert(datasss);
                console.log(data)
            },
            error: function(data) {
                alert('获取数据失败')
            }
        });
    }
</script>

2.后台

def main(*args):
    test = r"D:\pm\myapp\1.xlsx"
    df0 = pd.read_excel(test, index_col=0, parse_dates=[0])
    list_city=['南京','无锡','常州','苏州','徐州','南通','连云港','淮安','盐城','扬州','镇江','泰州','宿迁']
    list_fc=['粮食加工品','肉制品','乳制品','水产制品']
    city = list_city[int(args[0].POST['city'])]
    _type = list_fc[int(args[0].POST['type'])]
    day = int(args[0].POST['day'])

3.报错

django.utils.datastructures.MultiValueDictKeyError: 'city'

import traceback
def main(*args):
  try:
    request = args[0]
    assert type(request) == type(django.http.HttpRequest())
    #Todo: your code...
    assert request.POST.get('city', None) is not None
    assert request.POST.get('type', None) is not None
    assert request.POST.get('day', None) is not None
  except Exception as err:
    #print(err)
    traceback.print_exc()

服务端看看出错在哪里，没有问题再排除客户端数据格式
https://docs.djangoproject.com/en/4.0/intro/tutorial03/