here is code I used: import copy import dash from dash.dependencies import Input, Output import dash_html_components as html import dash_core_components as dcc import datetime from flask_caching import Cache import numpy as np import os import pandas as pd import time app = dash.Dash(__name__) ca…

It looks like you’re returning a Pandas DataFrame and Series from your callback. Dash callback return values need to be serialised into JSON to be send to the client. The JSON encoder that’s being used (looks like it could be either simplejson or the standard-lib json depending on which is available…

I recommend trying return df.to_json() and reading the data with df = pd.read_json(jsonified_dataframe) (some more examples here: https://plot.ly/dash/sharing-data-between-callbacks )

thanks for your reply. I have tried this out before. But it turned out to be the same error .I think Json cant be retrieved by dataframe but list. I can make the dash app work by returning a list only.

Rows x columns is not JSON serializable?

Dash Python

BingWong November 16, 2017, 8:06am 5

this is how I fixed the problem : Issues with "Caching and Signaling"

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Rows x columns is not JSON serializable?

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