trace2 = go.Bar(
    x=temp_df1.city,
    y=temp_df1.id.cumsum().shift(1),
    #name='No. of stations',
    hoverinfo=None,
    marker=dict(
        color='rgba(1,1,1,0.0)'
    )
)
trace1 = go.Bar(
    x=temp_df1.city,
    y=temp_df1.id,
    name='No. of stations',
    text=temp_df1.id,
    textposition='outside',
    marker=dict(
        color=chosen_colors[0]
    )
)


data=[trace2, trace1]

layout = go.Layout(
    title='No. of bike stations in Bay Area cities',
    xaxis=dict(
        title='City'
    ),
    yaxis=dict(
        title='No. of bike stations'
    ),
    barmode='stack',
    hovermode='closest',
    showlegend=False
)

figure = go.Figure(data=data, layout=layout)

ply.iplot(figure)