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问题描述解决方案

问题描述

运行dash官网的示例时报错：ValueError: All arguments should have the same length. The length of argumentyis 2, whereas the length of previous arguments ['x'] is 3

import dash import dash_core_components as dcc import dash_html_components as html import plotly.express as px import pandas as pd external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css'] app = dash.Dash(__name__, external_stylesheets=external_stylesheets) # assume you have a "wide-form" data frame with no index # see https://plotly.com/python/wide-form/ for more options df = pd.DataFrame({"x": [1, 2, 3], "SF": [4, 1, 2], "Montreal": [2, 4, 5]}) fig = px.bar(df, x="x", y=["SF", "Montreal"], barmode="group") app.layout = html.Div(children=[ html.H1(children='Hello Dash'), html.Div(children=''' Dash: A web application framework for Python. '''), dcc.Graph( id='example-graph', figure=fig ) ]) if __name__ == '__main__': app.run_server(debug=True)

解决方案

更新plotly

pip install plotly --upgrade