Python: Plotly & Dash | 实时图 dcc.Interval，function 调用了两次...错误？

Question

在这里的第一篇文章，我希望你能帮助我解决这个奇怪的情况......我正在使用 plotly (dcc.Interval) 进行一些实时绘图，我只是发现我用来获取数据的函数之一被调用了两次在执行期间。 这很奇怪，因为我只是调用了这个 function 一次，它真的弄乱了我的代码：

import dash
from dash.dependencies import Output, Input
import dash_core_components as dcc
import dash_html_components as html
import plotly
import plotly.graph_objs as go

import random

X = []; X.append(0)
Y = []; Y.append(1)

# THIS IS AN EXAMPLE OF A FUNCTION
def formula():
    er = 'text'
    return(er)

# CALLING THE FORMULA, JUST PRINTING THE TEXT
print(formula())

app = dash.Dash(__name__)

app.layout = html.Div(children=[
    html.H1(children='Ejemplo grafica'),
    dcc.Graph(id='live-graph', animate=True),
    dcc.Interval(
        id='graph-update',
        interval=1000
        ),
    ]
)

@app.callback(Output('live-graph', 'figure'),
              [Input('graph-update', 'n_intervals')])

def update_graph(input_data):
    X.append(X[-1]+1)
    Y.append(Y[-1]+Y[-1]*random.uniform(-0.1,0.1))

    data = plotly.graph_objs.Scatter(
            x=list(X),
            y=list(Y),
            name='Scatter',
            mode= 'lines'
            )

    return {'data' : [data],
            'layout' : go.Layout(
                xaxis=dict(range=[X[0],X[-1]]),
                yaxis=dict(range=[min(Y)-0.1,max(Y)+0.1]),)
            }

if __name__ == '__main__':
    app.run_server(host='127.0.0.1', port=8080 ,debug=True)

程序的output为：

C:\Users\s3853339\Miniconda3\envs\spec\python.exe C:/pythonprojects/spectrometer/test_plotly.py
text # FUNCTION HAS BEEN CALLED ONCE
Dash is running on http://127.0.0.1:8080/

 * Serving Flask app 'test_plotly' (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: on
text # SECOND CALLING OF THE FUNCTION... WHAT HAPPENED HERE???

Answer 1

代码运行两次，因为您处于调试模式。 设置debug=False ，它应该只执行一次。