Django 和 folium integration 返回 'None'

我正在尝试使用folium在我的django应用程序中获取地图。

代码如下：

def map(request):
    data = pd.DataFrame({
        'lat': [77, 75, 72, 77, 78],
        'lon': [28, 26, 19, 29, 30],
        'name': ['Buenos Aires', 'jaipur', 'mumbai', 'gurgaon', 'dehradun']
    })
    m = folium.Map(location=[21, 78], tiles="Mapbox Bright", zoom_start=4.75)
    for i in range(0, len(data)):
        folium.Marker([data.iloc[i]['lon'], data.iloc[i]['lat']], popup=data.iloc[i]['name']).add_to(m)
    m.save('graph.html')
    context = {'map': m}
    print("context is", context)
    return render(request, 'classroom/teachers/map.html', context)

Urls.py

    path('map', teachers.map, name='map'),

.HTML

<html lang="en">
<head>
     <meta charset="UTF-8">
     <title>Title</title>
</head>
<body>
{{ map.render }}
</body>

我希望它显示一张地图，在给定的纬度和经度上带有一些标记，但有些不对劲。我需要更改什么才能获得预期的结果？

先导入熊猫和叶子，然后尝试遵循此模式

import folium
import pandas
data = pandas.read_csv("Volcanoes_USA.txt")
lat = list(data["LAT"])
lon = list(data["LON"])
elev = list(data["ELEV"])
def color_producer(elevation):
    if elevation < 1000:
      return 'green'
    elif 1000 <= elevation < 3000:
      return 'orange'
    else:
      return 'red'
map=folium.Map(location=[38.58,-99.09],zoom_start=6,tiles="Mapbox Bright")
fg = folium.FeatureGroup(name="My Map")
    for lt, ln, el in zip(lat, lon, elev):
    fg.add_child(folium.CircleMarker(location=[lt, ln], radius=6, popup=str(el) + "m",
       fill_color = color_producer(el), color='grey', fill_opacity=0.7))
    fg.add_child(folium.GeoJson(data=open('world.json','r',encoding='utf-8-sig').read()),
    style_function = lambda x: {'fillColor': 'yellow'})
map.add_child(fg)
map.save("Map1.html")

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