Python+Altair (Vega-Lite)：网络服务器

Question

I want to visualize some graphs on web pages using Python 2.7.12 and Altair 1.2.0.

Using their examples it is easy and straightforward:

from altair import *
from altair import Chart, load_dataset

# load built-in dataset as a pandas DataFrame
cars = load_dataset('cars')

chart = Chart(cars).mark_circle().encode(
    x='Horsepower',
    y='Miles_per_Gallon',
    color='Origin',
)

chart.display()  

This works in Jupyter Notebook.

Changing chart.display() to chart.server() (as described at https://altair-viz.github.io/documentation/displaying.html#displaying-plots-via-a-local-http-server ) should be enough to start a web server using Python's HTTPServer.

It starts, but the page it provides is empty. The source is there but nothing is visualized.

Any idea about why?

Answer 1

Adding my previous comment as an answer:

chart.serve() is working as expected for me (altair 2.1.0). The documentation has moved to here https://altair-viz.github.io/user_guide/display_frontends.html?e#working-in-non-notebook-environments

from altair import Chart, load_dataset

# load built-in dataset as a pandas DataFrame
cars = load_dataset('cars')

chart = Chart(cars).mark_circle().encode(
    x='Horsepower',
    y='Miles_per_Gallon',
    color='Origin',
)

chart.serve()