我想上传一个csv文件并生成一个从csv文件输出数据的图形,我能够上载csv并使用dash_table显示数据,但是我无法使该图形工作。上载csv文件后出现我的错误:无效的参数figure.data
传递给ID为“ Mygraph”的Graph。期望一个数组。提供了类型object
。
import base64
import datetime
import io
import plotly.graph_objs as go
import cufflinks as cf
import dash
from dash.dependencies import Input, Output, State
import dash_core_components as dcc
import dash_html_components as html
import dash_table
import pandas as pd
external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']
app = dash.Dash(__name__, external_stylesheets=external_stylesheets)
server = app.server
colors = {
"graphBackground": "#F5F5F5",
"background": "#ffffff",
"text": "#000000"
}
app.layout = html.Div([
dcc.Upload(
id='upload-data',
children=html.Div([
'Drag and Drop or ',
html.A('Select Files')
]),
style={
'width': '100%',
'height': '60px',
'lineHeight': '60px',
'borderWidth': '1px',
'borderStyle': 'dashed',
'borderRadius': '5px',
'textAlign': 'center',
'margin': '10px'
},
# Allow multiple files to be uploaded
multiple=True
),
dcc.Graph(id='Mygraph'),
html.Div(id='output-data-upload')
])
@app.callback(Output('Mygraph', 'figure'), [
Input('upload-data', 'contents'),
Input('upload-data', 'filename')
])
def update_graph(contents, filename):
fig = {
'layout': go.Layout(
plot_bgcolor=colors["graphBackground"],
paper_bgcolor=colors["graphBackground"]
)
}
if contents:
contents = contents[0]
filename = filename[0]
df = parse_data(contents, filename)
df = df.set_index(df.columns[0])
fig['data'] = df.iplot(
asFigure=True, kind='scatter', mode='lines+markers', size=1)
return fig
def parse_data(contents, filename):
content_type, content_string = contents.split(',')
decoded = base64.b64decode(content_string)
try:
if 'csv' in filename:
# Assume that the user uploaded a CSV or TXT file
df = pd.read_csv(
io.StringIO(decoded.decode('utf-8')))
elif 'xls' in filename:
# Assume that the user uploaded an excel file
df = pd.read_excel(io.BytesIO(decoded))
elif 'txt' or 'tsv' in filename:
# Assume that the user upl, delimiter = r'\s+'oaded an excel file
df = pd.read_csv(
io.StringIO(decoded.decode('utf-8')), delimiter=r'\s+')
except Exception as e:
print(e)
return html.Div([
'There was an error processing this file.'
])
return df
@app.callback(Output('output-data-upload', 'children'),
[
Input('upload-data', 'contents'),
Input('upload-data', 'filename')
])
def update_table(contents, filename):
table = html.Div()
if contents:
contents = contents[0]
filename = filename[0]
df = parse_data(contents, filename)
table = html.Div([
html.H5(filename),
dash_table.DataTable(
data=df.to_dict('rows'),
columns=[{'name': i, 'id': i} for i in df.columns]
),
html.Hr(),
html.Div('Raw Content'),
html.Pre(contents[0:200] + '...', style={
'whiteSpace': 'pre-wrap',
'wordBreak': 'break-all'
})
])
return table
if __name__ == '__main__':
app.run_server(debug=True)
您需要创建一个go.Figure
对象并返回它,例如:
@app.callback(Output('Mygraph', 'figure'), [
Input('upload-data', 'contents'),
Input('upload-data', 'filename')
])
def update_graph(contents, filename):
x = []
y = []
if contents:
contents = contents[0]
filename = filename[0]
df = parse_data(contents, filename)
df = df.set_index(df.columns[0])
x=df['DATE']
y=df['TMAX']
fig = go.Figure(
data=[
go.Scatter(
x=x,
y=y,
mode='lines+markers')
],
layout=go.Layout(
plot_bgcolor=colors["graphBackground"],
paper_bgcolor=colors["graphBackground"]
))
return fig
取决于您想要的图形类型(例如go.Scatter
)和要显示的值的类型(x
和y
值)。要向绘图添加更多线,可以向go.Scatter
数组添加具有不同值的更多data
对象。