Implementing a upload button for a bokeh Web App

Well, what i am doing is adding a upload file button allowing to upload csv files. Those files are generated locally by another system. And i want my web app devlopped in bokeh/python through DATAIKU, to upload this file . Then i will process the data through my web application.

So i think there is 2 steps to work on:

1- Be able to retrieve a local file

2- Then being able to store it in DSS

So i can show you some extract of the code .Today i have the following code , to create the button.

I do use the function def upload to display the path of the file that was selected. For instance , if i select the file file.csv locally present on my path C:\Temp\file.csv, when using the FileInput class, when i display the path of the selected file , this one is forced to "C:\fakepath\file.csv"

import numpy as np
import pandas as pd
from bokeh.io import curdoc
from bokeh.layouts import row, widgetbox
from bokeh.models import ColumnDataSource
from bokeh.models.widgets import Slider, TextInput
from bokeh.plotting import figure
from bokeh.models import Select, PreText
from bokeh.events import ButtonClick
from bokeh.models import ColumnDataSource, Slider, TextInput,Button
from bokeh.layouts import row, column, gridplot

from bokeh.core.properties import List, String, Dict, Int, Complex, Float

from bokeh.models import Button, LayoutDOM

IMPL = """
import * as p from "core/properties"
import {LayoutDOM, LayoutDOMView} from "models/layouts/layout_dom"

export class FileInputView extends LayoutDOMView
initialize: (options) ->
super(options)
input = document.createElement("input")
input.type = "file"
input.onchange = () =>
@model.value = input.value
@el.appendChild(input)

export class FileInput extends LayoutDOM
default_view: FileInputView
type: "FileInput"
@define {
value: [ p.String ]
}
"""

class FileInput(LayoutDOM):
__implementation__ = IMPL
value = String()

.....

input = FileInput().

.....

def upload():
print(input.value)
df=pd.read_csv(input.value)

inputs = widgetbox(sensor_type,operation_type)
load_file=column([input,button])
curdoc().add_root(row(inputs,load_file, plot, width=800))

Thank you for the feedback.

The initial reason of my code was that the FileInput class is not found in the current bokeh version used by Dataiku.

How cani check the bokeh version that is used?

2021-01-05 22:56:22,167 ERROR Error running application handler <bokeh.application.handlers.directory.DirectoryHandler object at 0x7fc0d8a64510>: cannot import name FileInput
File "main.py", line 15, in <module>:
from bokeh.models.widgets import FileInput Traceback (most recent call last):
File "/export/home/applis/dataiku-dss-8.0.2/python.packages/bokeh/application/handlers/code_runner.py", line 163, in run
exec(self._code, module.__dict__)
File "/home/dss_data/tmp/DV_MANUFACTURING_PHM/web_apps/0q9oht6/backend/main.py", line 15, in <module>
from bokeh.models.widgets import FileInput
ImportError: cannot import name FileInput