幫助！在python

Question

關鍵的錯誤，我不斷收到此錯誤：

MultiValueDictKeyError at /search/ 

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

我剛開始學習編程，前兩天，所以有人可以通俗地說解釋爲什麼有一個問題，以及如何解決它。謝謝！

這裏是編程的部分：

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}) 

---

編輯

1）Business.object是我的企業數據庫。它們與如姓名，城市等屬性，我試圖讓一個程序，將通過他們的屬性（S）

2）不重複的職位

3搜索業務），我該怎麼辦的對象在我嘗試使用它們之前檢查這些密鑰是否存在？

Answer 1

它看起來像你可能會收到此錯誤的唯一地方是在這條線：

name = request.GET['name'] 

你沒有檢查，如果「名」在字典request.GET中嘗試訪問它像以前一樣你在上面做過，所以你會得到一個關鍵的錯誤，如果該關鍵字不存在request.GET。

所以它看起來像您需要更改以下部分，檢查「名稱」和「城市」鍵在字典request.GET中存在您嘗試訪問該值之前：

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})