我无法在emotion.html中打印变量

Question

我是python的新手，我正在使用spotify api检测音乐的情感，但当我将字典值传递给html时，它什么也不打印。而我可以在命令行中打印，

当我写{{ energy }}时，当我访问localhost:8000//emotion时，它不打印任何内容

这是我在views.py中的函数

def emotion(request):
from mutagen.id3 import ID3
from mutagen.mp3 import MP3
import sys
import spotipy
from spotipy.oauth2 import SpotifyClientCredentials
import requests
import spotify_token as st
import requests

client_id = '**********************'
client_secret = '*****************************'
title = 'lollypop'
artist = 'pawan singh'

client_credentials_manager = SpotifyClientCredentials(client_id=client_id, client_secret=client_secret)
sp = spotipy.Spotify(client_credentials_manager=client_credentials_manager)
sp.trace=False
search_query = title+ ' ' + artist
result = sp.search(search_query)
for i in result['tracks']['items']:
    # Find a songh that matches title and artist
    if (i['artists'][0]['name'] == artist) and (i['name'] == title):
        print (i['uri'])
        break
else:
    try:
        # Just take the first song returned by the search (might be named differently)
        print (result['tracks']['items'][0]['uri'])
        uri = result['tracks']['items'][0]['uri']
        client_credentials_manager = SpotifyClientCredentials(client_id=client_id, client_secret=client_secret)
        sp = spotipy.Spotify(client_credentials_manager=client_credentials_manager)
        sp.trace=False
        features = sp.audio_features(uri)

        data = {
            'energy' : features[0]['energy'],
            'key' : features[0]['key'],
            'valence': features[0]['valence'],
            'danceability': features[0]['danceability'],
            'loundness' : features[0]['loudness'],
            'tempo' : round(features[0]['tempo']),
            'acousticness' : features[0]['acousticness'],
            'liveness' : features[0]['liveness'],
            'instrumentalness' : features[0]['instrumentalness'],
        }

        print(features[0]['energy'])  # Prints successfully 0.862
        
    except:
        data = { 'error' : 'NO SONGS FOUND' }
return render(request, 'emotion_view.html', data)

这是我在模板中的emotion_view.html

{{ energy }}

在emotion_view.html中，它不打印任何内容，这有什么问题吗？

Answer 1

在emotion_view.html中将{{energy}}更改为{{error}}，因为在数据字典中传递的是'error'而不是'energy'