I would like to create an web app in python and Dash. The first that I try is to create a dropdown.
I've these data :
Date,FS,Total,Used,Mount
2020-01-25-12-00,/dev/hd1/,350,300,/dev/mount1
2020-01-25-18-00,/dev/hd2/,370,320,/dev/mount2
2020-01-26-06-00,/dev/hd3/,395,350,/dev/mount3
2020-01-26-12-00,/dev/hd1/,350,300,/dev/mount1
2020-01-26-18-00,/dev/hd2/,370,320,/dev/mount2
2020-01-27-06-00,/dev/hd3/,395,350,/dev/mount3
2020-01-27-12-00,/dev/hd1/,350,300,/dev/mount1
2020-01-27-18-00,/dev/hd2/,370,320,/dev/mount2
2020-01-28-06-00,/dev/hd3/,395,350,/dev/mount3
2020-01-28-12-00,/dev/hd1/,350,300,/dev/mount1
2020-01-28-18-00,/dev/hd2/,370,320,/dev/mount2
2020-01-29-06-00,/dev/hd3/,395,350,/dev/mount3
I would like to create a dropdown with all the FS of my CSV. I try that :
import dash
import dash_core_components as dcc
import dash_html_components as html
import sys
import os
import pandas as pd
app = dash.Dash
df = pd.read_csv('/xxx/xxx/xxx/xxx/xxx/xxx/data.txt')
test = df['FS'].unique()
dcc.Dropdown(
options=[test],
searchable=False
)
if __name__ == '__main__':
app.run_server(debug=True)
But the output is
Traceback (most recent call last):
File "./import dash.py", line 25, in <module>
app.run_server(debug=True)
TypeError: run_server() missing 1 required positional argument: 'self'
Can you tell me why ?
There are some issues in your code:
You have to assign a name to your dash application, eg app = dash.Dash('app_name')
Your csv has mixed separators ( ,
in header and ;
in tuples)
The dropdown-options syntax is {'label: 'somelabel', 'value':'somevalue'}
, eg (ref. Dropdown Examples and Reference )
options=[
{'label': 'New York City', 'value': 'NYC'},
{'label': 'Montreal', 'value': 'MTL'},
{'label': 'San Francisco', 'value': 'SF'}
],
app.layout
To sum up:
import dash
import dash_core_components as dcc
import dash_html_components as html
import sys
import os
import pandas as pd
app = dash.Dash('app_name')
df = pd.read_csv('/xxx/xxx/xxx/xxx/xxx/xxx/data.txt')
test = df['FS'].unique()
options = [{'label': t, 'value': t} for t in test]
app.layout = dcc.Dropdown(
options=options,
searchable=False
)
if __name__ == '__main__':
app.run_server(debug=True)
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