来自Model属性实例的HTML包含标签

Question

我正在尝试渲染：

1. 直方图另存为png图像
2. 来自html文件的福利地图

我已经成功渲染了直方图，但是没有渲染Folium地图。取而代之的是， results.html 加载了NONE，我希望在该位置上可以找到Folium地图。

我不确定是否可以将HTML include标签用于属性实例方法？

Models.py

class Hashtag(models.Model):

    def display_locations(self):
        """ Function to create a dict by frequency of the locations associated with search_text """
        country_list = list(self.location.values_list('country', flat=True).all())
        for country in country_list:
            location_freq = {i:country_list.count(i) for i in set(country_list)}
            return location_freq

    @property
    def get_histogram(self):
        """ Function to create and save histogram of Hashtag.locations """
        location_freq = self.display_locations()
        plt.bar(list(location_freq.keys()), location_freq.values(), color='g')
        plt.show()
        plt.savefig('mapping_twitter/static/mapping_twitter/images/histogram/histogram.png')

    @property
    def get_heatmap(self):
        """ Function to create and save heatmap of Hashtag.locations """
        location_map = folium.Map(
            location=[51.5074, 0.1278],
            tiles="Stamen Terrain",
            zoom_start=12)
        location_map.save('mapping_twitter/templates/mapping_twitter/heatmap.html') 

Results.html

<h3>Histogram</h3>
<div class="boxed">
    <p>
        {{ hashtag.get_histogram }}
        <img src="{% static 'mapping_twitter/images/histogram/histogram.png' %}" />
    </p>
</div>

<h3>Heatmap</h3>
<div class="boxed">
    <p>
        {{ hashtag.get_heatmap }}
        {% include 'mapping_twitter/heatmap.html' %}
    </p>
</div>