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I'm working on a website to get videos via key words using google api on Django. The function for calling api works well individually, but once I called the function in view.py and run the server, it returns server error. why?

def youtube_search(options):


 DEVELOPER_KEY = "AIzaSyBQG9ozouzPofCHE4J-BHdUeSjqqtemnc0"
 YOUTUBE_API_SERVICE_NAME = "youtube"
 YOUTUBE_API_VERSION = "v3"

 youtube = build(YOUTUBE_API_SERVICE_NAME, YOUTUBE_API_VERSION,
 developerKey=DEVELOPER_KEY)

 parser = argparse.ArgumentParser()
 parser.add_argument("--q", help="Search term", default=options)
 parser.add_argument("--max-results", help="Max results", default=1) # 
the number of default is the number of output videos
 options= parser.parse_args()


 search_response = youtube.search().list(
 q=options.q,
 part="id,snippet",
 maxResults=options.max_results
 ).execute()

 videos = 
 videoid = 
 channels = 
 playlists = 
 result = 


 for search_result in search_response.get("items", ):
 if search_result["id"]["kind"] == "youtube#video":
 videos.append( search_result["snippet"]["title"])
 videoid.append( search_result["id"]["videoId"])

 for line in videos:

 result.append(line)

 for line1 in videoid:
 line1 = "http://www.youtube.com/watch?v="+line1
 result.append(line1)

 return result

and here are the view.py calling the function:

def index2(request):
if request.method == "POST":
 search=request.POST.get("search:",None)
 class1 = predict.predict(search)
 #list =[search, 'other corresponding tags']

 api = YTapi.youtube_search(search)
 video = api[0]
 videoid = api[1]
return render(request, "index2.html","video":video,"videoid":videoid)