title: How to Plot a graph inside plotly-dash app
body: <p>I am new to dash and I have a plot which I can plot outside dash-plotly app but am unable to plot the same graph inside dash app. Here is my dash app code:</p>
  
  <pre><code>import dash
  import dash_core_components as dcc
  import dash_html_components as html
  from dash.dependencies import Input, Output
  import plotly.graph_objects as go
  from plotly.offline import iplot
  import pandas as pd
  import numpy as np
  
  # intialise data of lists.
  data = {'Name':['Nick hospital', 'Nick hospital','Nick hospital', 'Krish hospital', 'Krish hospital','Krish hospital'],
          'NAR_forms_used':[2, 1,2, 2, 2,3]
         }
  
  # Create DataFrame
  df = pd.DataFrame(data)
  
  # get counts per NAR type
  df_nar=pd.DataFrame(df.groupby('Name')['NAR_forms_used'].value_counts())
  df_nar=df_nar.rename({'NAR_forms_used': 'Doc count'}, axis='columns')
  df_nar=df_nar.reset_index()
  
  # Manage NAR types (who knows, there may be more types with time?)
  nars = df_nar['NAR_forms_used'].unique()
  nars = nars.tolist()
  nars.sort(reverse=False)
  
  # set up plotly figure
  fig = go.Figure()
  
  # add one trace per NAR type and show counts per hospital
  for nar in nars:
  # subset dataframe by NAR type
      df_ply=df_nar[df_nar['NAR_forms_used']==nar]
  
      # add trace
      fig.add_trace(go.Bar(x=df_ply['Name'], y=df_ply['NAR count'], name='NAR Type='+str(nar)))
  
      # make the figure a bit more presentable
  
  fig.update_layout(title='NAR per hospital',
                  yaxis=dict(title='&lt;i&gt;count of NAR types&lt;/i&gt;'),
                  xaxis=dict(title='&lt;i&gt;Hospital&lt;/i&gt;',
                      )
              )
  
  
  fig.show()
  
  external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']
  
  app = dash.Dash(__name__, external_stylesheets=external_stylesheets)
  
  app.layout = html.Div([
      dcc.Graph(id='graph'
      ),
      dcc.Dropdown(
                  id="Hosp_list",
                  options=[{"label": i, "value": i} for i in hosp_list],
                  multi=True,
                  value=list(),
  
          )
  ])
  
  
  
  
  
  if __name__ == '__main__':
      app.run_server(debug=True)
  </code></pre>
  
  <p>I did like to display the same bar graph on dash dcc.graph section. As you can see the code outside dash app runs and gives the plot but I not sure how to implement the same inside dash app. Kindly assist me to plot this graph inside the dash app</p>