制作不同颜色的堆叠条形图

Question

So I'm creating a plotly bar chart that is stacked. Each of my stacks are returning the same color. I'd like them to have different colors. I'd prefer not to use plotly express in this situation. I also don't want to specify the color. I just want a vareity of colors. Here's my code:

  df2 = pd.DataFrame.from_dict({'Country': {0: 'Europe',
  1: 'America',
  2: 'Asia',
  3: 'Europe',
  4: 'America',
  5: 'Asia',
  6: 'Europe',
  7: 'America',
  8: 'Asia',
  9: 'Europe',
  10: 'America',
  11: 'Asia'},
 'Year': {0: 2014,
  1: 2014,
  2: 2014,
  3: 2015,
  4: 2015,
  5: 2015,
  6: 2016,
  7: 2016,
  8: 2016,
  9: 2017,
  10: 2017,
  11: 2017},
 'Amount': {0: 1600,
  1: 410,
  2: 150,
  3: 1300,
  4: 300,
  5: 170,
  6: 1000,
  7: 500,
  8: 200,
  9: 900,
  10: 500,
  11: 210}})

fig = go.Figure()
fig.add_trace(go.Bar(x=df2['Year'], y=df['Amount'], 
                        ))
fig.update_layout(title="Personnel at Work",
                 barmode='stack')
fig.show()

Answer 1

To create a stacked graph with a graph object, you can specify the graph as the stacking unit.

import pandas as pd
import plotly.graph_objects as go

fig = go.Figure()

x = [str(x) for x in df2['Year'].unique().tolist()]

for c in df2['Country'].unique():
    df3 = df2.query('Country == @c')
    fig.add_trace(go.Bar(x=x, y=df3['Amount'], name=c))
fig.update_layout(title="Personnel at Work", barmode='stack')
fig.show()