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Cufflinks and subplots

Good day guys
I am having a challenge of generating subplots using cufflinks. Using the Cufflinks tutorial to generate the function am using which I wrote as follows
import dash
from dash.dependencies import Input, Output
import dash_core_components as dcc
import dash_html_components as html
from pandas_datareader import data as web
from datetime import datetime as dt
import pandas as pd
import cufflinks as cf
from plotly.offline import iplot
import as tls

   def subplots(df,x):
        hover_text = df.apply(lambda r: '<br>'.join(['{}: {}'.format(c, r[c])
                                                     for c in df.columns]), axis=1)

        fig = tls.make_subplots(rows=2, cols=1, shared_xaxes=True)
        fig.append_trace({'x': df.index, 'y': df.Close, 'type': 'scatter',
                          'name': x, 'text': hover_text}, 1, 1)
        fig.append_trace({'x': df.index, 'y': df.Volume, 'type': 'bar',
                          'name': 'Volume', 'text': hover_text}, 2, 1)
        figure = iplot(fig)
        return figure

app = dash.Dash()

app.layout = html.Div([
    html.H1('Stock Tickers'),
            {'label': 'Coke', 'value': 'COKE'},
            {'label': 'Tesla', 'value': 'TSLA'},
            {'label': 'Apple', 'value': 'AAPL'}
@app.callback(Output('my-graph', 'figure'), [Input('dropdown', 'value')])
def update_graph(selected_dropdown_value):
    df = web.DataReader(
        selected_dropdown_value, data_source='google',
        start=dt(2017, 1, 1),
    return subplots(df,selected_dropdown_value)

if __name__ == '__main__':

But am returning a blank canvas for the plot. What could I have done wrongly there.

In the console am getting the format of the plot grid but on the page its blank, is there a way of resolving this.