帮助！在python

Question

关键的错误，我不断收到此错误：

MultiValueDictKeyError at /search/ 

"Key 'name' not found in <'QueryDict: {}>" 

我刚开始学习编程，前两天，所以有人可以通俗地说解释为什么有一个问题，以及如何解决它。谢谢！

这里是编程的部分：

def NameAndOrCity(request): 
    NoEntry = False 
    if 'name' in request.GET and request.GET['name']: 
     name = request.GET['name'] 
     if len(Business.objects.filter(name__icontains=name)) > 0: 
      ByName = Business.objects.filter(name__icontains=name) 
      q = set(ByName) 
      del ByName 
      ByName = q 

    if 'city' in request.GET and request.GET['city']: 
     city = request.GET['city'] 
     if len(Business.objects.filter(city__icontains=city)) > 0: 
      ByCity = Business.objects.filter(city__contains=city) 
      p = set(ByCity) 
      del ByCity 
      ByCity = p 


    if len(q) > 0 and len(p) > 0: 
      NameXCity = q & p 
      return render_to_response('search_results.html', {'businesses':NameXCity, 'query':name}) 
     if len(q) > 0 and len(p) < 1: 
      return render_to_response('search_results.html', {'businesses':ByName, 'query':name}) 
     if len(p) > 0 and len(q) < 1: 
      return render_to_response('search_results.html', {'businesses':ByCity, 'query':city}) 
     else: 
      NoResults = True 
      return render_to_response('search_form.html', {'NoResults': NoResults}) 
    else: 
     name = request.GET['name'] 
     city = request.GET['city'] 
     if len(name) < 1 and len(city) < 1: 
      NoEntry = True 
     return render_to_response('search_form.html', {'NoEntry': NoEntry}) 

---

编辑

1）Business.object是我的企业数据库。它们与如姓名，城市等属性，我试图让一个程序，将通过他们的属性（S）

2）不重复的职位

3搜索业务），我该怎么办的对象在我尝试使用它们之前检查这些密钥是否存在？

Answer 1

它看起来像你可能会收到此错误的唯一地方是在这条线：

name = request.GET['name'] 

你没有检查，如果“名”在字典request.GET中尝试访问它像以前一样你在上面做过，所以你会得到一个关键的错误，如果该关键字不存在request.GET。

所以它看起来像您需要更改以下部分，检查“名称”和“城市”键在字典request.GET中存在您尝试访问该值之前：

name = request.GET['name'] 
city = request.GET['city'] 
if len(name) < 1 and len(city) < 1: 
    NoEntry = True 
return render_to_response('search_form.html', {'NoEntry': NoEntry})