Folium not showing map, only a grey box

Question

I have just begun with folium and although a box comes up, with the Leaflet | Data by OpenStreetMap ..| in the lower right hand corner, the box doesn't show a map. The code is simple

import folium
from folium import Choropleth, Circle, Marker
from folium.plugins import HeatMap, MarkerCluster

# Create a map
m_1 = folium.Map(location=[42.32,-71.0589], tiles='openstreetmap', zoom_start=10)

# Display the map
m_1

I receive no errors, just a grey box where the map should be -- even the Plus and Minus signs are in the upper left corner.

Any thoughts?

Thanks!

Answer 1

It works for me, with max_zoom and control_scale set:

folium.Map(tiles='openstreetmap', zoom_start=10, max_zoom=23, control_scale=True, location=[42.32, -71.0589])

Answer 2

Review the network traffic in your browser's developer console to see if the map tiles are returning a 200. I tested your code and it worked for me which indicates your code is correct but the map tiles are failing to load on your network.