ValueError at/url /視圖frontend.views.url沒有返回HttpResponse對象。它返回None而不是

Question

我寫了一段代碼，當用戶在頁面的表單字段中輸入url時，它將解析頁面：「url.html」。當用戶在表單字段中輸入url時，它會出現在這個視圖中（在instance.web_url中）。但即時獲取HTTPResponse對象的這個錯誤。下面的代碼：

def url(request): 
    if request.method == 'POST': 
     form_url = WebURLForm(request.POST or None) 
     title = "Search via URL here" 
     instance = form_url.save(commit = False) 
     instance.save() 

     if instance.web_url == "": 
      instance.web_url = "http://www.facebook.com/" 
     print instance.web_url 


     html = urllib.urlopen(instance.web_url).read() 
     soup = BeautifulSoup(html,"lxml") 
     lines = [] 
# kill all script and style elements 
     for script in soup(["script", "style"]): 
      script.extract() # rip it out 

# get text 
     text = soup.get_text() 

#break into lines and remove leading and trailing space on each 
     lines = (line.strip() for line in text.splitlines()) 
#break multi-headlines into a line each 
     chunks = (phrase.strip() for line in lines for phrase in line.split(" ")) 
#drop blank lines 
     text = '\n'.join(chunk for chunk in chunks if chunk) 

     text=text.encode('utf-8') 


     words = text.split(".") 

     count=0 
     terrorism_level=0 
     for i in words: 
      print count 
      if not words[count]: 
       words[count] = "this was empty before." 
      json_result = natural_language_classifier.classify('90e7b7x198-nlc-50734',words[count]) 
      classes = json_result['classes'] 
      result = json.dumps(classes, indent=2) 
      if (classes[0]['confidence'] > 0.98 and classes[0]['class_name'] == "nhate."): 
       print words[count] 
       print result 
      terrorism_level +=1 
      count=count+1  

     context = {"form_url":form_url, "title":title} 
     return render(request,'url.html',context) 

Answer 1

def url(request): 
    if request.method == 'POST': 
     form_url = WebURLForm(request.POST or None) 
     title = "Search via URL here" 
     instance = form_url.save(commit = False) 
     instance.save() 

     if instance.web_url == "": 
      instance.web_url = "http://www.facebook.com/" 
     print instance.web_url 


     html = urllib.urlopen(instance.web_url).read() 
     soup = BeautifulSoup(html,"lxml") 
     lines = [] 
# kill all script and style elements 
     for script in soup(["script", "style"]): 
      script.extract() # rip it out 

# get text 
     text = soup.get_text() 

#break into lines and remove leading and trailing space on each 
     lines = (line.strip() for line in text.splitlines()) 
#break multi-headlines into a line each 
     chunks = (phrase.strip() for line in lines for phrase in line.split(" ")) 
#drop blank lines 
     text = '\n'.join(chunk for chunk in chunks if chunk) 

     text=text.encode('utf-8') 


     words = text.split(".") 

     count=0 
     terrorism_level=0 
     for i in words: 
      print count 
      if not words[count]: 
       words[count] = "this was empty before." 
      json_result = natural_language_classifier.classify('90e7b7x198-nlc-50734',words[count]) 
      classes = json_result['classes'] 
      result = json.dumps(classes, indent=2) 
      if (classes[0]['confidence'] > 0.98 and classes[0]['class_name'] == "nhate."): 
       print words[count] 
       print result 
      terrorism_level +=1 
      count=count+1  

     context = {"form_url":form_url, "title":title} 
     else: 
      form_url = WebURLForm() 
      context = {"form_url":form_url, "title":None} 
    return render(request,'url.html',context) 

試試這一次

Answer 2

，因爲你可能被稱爲使用GET方法的看法。另外，請閱讀Python教程和PEP-8。你的代碼格式不好，不符合PEP-8標準。