使用.GET[]时在/count/处出现多值dictKeyError

Question

我在执行代码：-

MultiValueDictKeyError at /count/ 'textbox' Request Method: GET Request URL: http://127.0.0.1:8000/count/ Django Version: 2.1 Exception Type: MultiValueDictKeyError Exception Value: 'textbox' Exception Location: /Users/rajans/anaconda3/lib/python3.7/site-packages/django/utils/datastructures.py in getitem, line 79 Python Executable: /Users/rajans/anaconda3/bin/python Python Version: 3.7.0 Python Path: ['/Users/rajans/Documents/djangoprojects/wordcount', '/Users/rajans/anaconda3/lib/python37.zip', '/Users/rajans/anaconda3/lib/python3.7', '/Users/rajans/anaconda3/lib/python3.7/lib-dynload', '/Users/rajans/anaconda3/lib/python3.7/site-packages', '/Users/rajans/anaconda3/lib/python3.7/site-packages/aeosa'] Server time: Tue, 5 Feb 2019 06:39:06 +0000

Python

from django.http import HttpResponse
from django.shortcuts import render

def homepage(request):
    return render(request,'home.html')


def contact(request):
    return HttpResponse("<h2> This is a contact_us page</h2><br> You can write to rajan.sharma@freshworks.com for any query")

def count(request):
    data=request.GET['textbox']
    data_list=split(data)
    data_len=len(data_list)
    return render(request,'count.html',{'length':data_len})
--------

html格式形式：-在

^{pr2}$

在count.html

<h1>Counted</h1><br/>
The length is :- {{length}}

Answer 1

看起来您没有将教科书变量作为参数传递到URL中。在

作为您的URL/尝试调用URL？教科书=“您要传递的值”

另外，建议使用.get方法作为

data = request.GET.get('textbook', None)

if data:
    # do something

Answer 2

您使用的是http://127.0.0.1:8000/count/这个url，当这个url调用函数时，它将与函数中的GET方法一起使用。您试图访问“textbox”，但在第一次访问textbox参数时，它显示错误

您需要修改视图函数并编写一个条件

def count(request):
    data=request.GET.get('textbox', None)
    if data:
        data_list=split(data)
        data_len=len(data_list)
        return render(request,'count.html',{'length':data_len})
    else:
        return render(request,'add here your html page name where input form is there')

Answer 3

使用MultiValueDict的get方法，如果textbox不存在，也可以提供默认值。在

data=request.GET.get('textbox', None)
if data:
   #process
else:
   #process