pie_chart.py

import plotly.graph_objects as go

fig2 = go.Figure(
  data=[go.Pie(
    labels=['Self-published','Top 10 Pubs.','Other Pubs.'],
    values=[self_pub_count, top_ten_count, other_pubs_count],    # these are counts generated from my data
    marker=dict(
      colors=['rgba(235, 141, 0, 0.75)', 'rgba(0, 45, 168, 0.5)', 'rgba(29, 122, 246,0.25)'],
      line=dict(color='rgba(0, 45, 168, 1)', width=3)            # style the pie sectors
    ),
    insidetextorientation="horizontal",
    textposition='outside',
    textfont_color=['rgba(235, 141, 0, 1)', 'rgba(0, 45, 168, 1)', 'rgba(29, 122, 246, 1)'],
    sort=False        # without this line, Plotly defaults to sorting sectors in order of size
  )]
)

fig2.update_layout(
  showlegend=False, 
  title= "Math",
  title_font_family="Arial Black",
  title_font_size=30,
  title_x=0.5,)       # center title

fig2.write_image("images/Math-pie.png")