Got "No module named 'dash_html_components'" although it is installed

Dash Python
2

Allow me to reply myself:

This is caused by old versions of dash related packages.

  1. First, update both dash-core-components and dash-html-components to the latest version of 2.0.0:
pip install --upgrade dash-html-components
pip install --upgrade dash-core-components
  1. update the code to call the core and html components:
import dash
# import dash_core_components as dcc    #deprecated
from dash import dcc 
# import dash_html_components as html    #deprecated
from dash import html
from dash.dependencies import Input, Output

I hope the Dash documents can update the contents accordingly.