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Pie Charts in Python

How to make Pie Charts.

Basic Pie Chart

A pie chart go.Pie object is a circular statistical chart, which is divided into sectors to illustrate numerical proportion. Data visualized by the sectors of the pie is set in values. The sector labels are set in labels. The sector colors are set in marker.colors.

In [1]:
import plotly.graph_objects as go

labels = ['Oxygen','Hydrogen','Carbon_Dioxide','Nitrogen']
values = [4500, 2500, 1053, 500]

fig = go.Figure(data=[go.Pie(labels=labels, values=values)])
fig.show()

Styled Pie Chart

Colors can be given as RGB triplets or hexadecimal strings, or with CSS color names as below.

In [2]:
import plotly.graph_objects as go
colors = ['gold', 'mediumturquoise', 'darkorange', 'lightgreen']

fig = go.Figure(data=[go.Pie(labels=['Oxygen','Hydrogen','Carbon_Dioxide','Nitrogen'], 
                             values=[4500,2500,1053,500])])
fig.update_traces(hoverinfo='label+percent', textinfo='value', textfont_size=20,
                  marker=dict(colors=colors, line=dict(color='#000000', width=2)))
fig.show()

Donut Chart

In [3]:
import plotly.graph_objects as go

labels = ['Oxygen','Hydrogen','Carbon_Dioxide','Nitrogen']
values = [4500, 2500, 1053, 500]

# Use `hole` to create a donut-like pie chart
fig = go.Figure(data=[go.Pie(labels=labels, values=values, hole=.3)])
fig.show()

Pie Charts in subplots

In [4]:
import plotly.graph_objects as go
from plotly.subplots import make_subplots

labels = ["US", "China", "European Union", "Russian Federation", "Brazil", "India", 
          "Rest of World"]

# Create subplots: use 'domain' type for Pie subplot
fig = make_subplots(rows=1, cols=2, specs=[[{'type':'domain'}, {'type':'domain'}]])
fig.add_trace(go.Pie(labels=labels, values=[16, 15, 12, 6, 5, 4, 42], name="GHG Emissions"),
              1, 1)
fig.add_trace(go.Pie(labels=labels, values=[27, 11, 25, 8, 1, 3, 25], name="CO2 Emissions"),
              1, 2)

# Use `hole` to create a donut-like pie chart
fig.update_traces(hole=.4, hoverinfo="label+percent+name")

fig.update_layout(
    title_text="Global Emissions 1990-2011",
    # Add annotations in the center of the donut pies.
    annotations=[dict(text='GHG', x=0.18, y=0.5, font_size=20, showarrow=False),
                 dict(text='CO2', x=0.82, y=0.5, font_size=20, showarrow=False)])
fig.show()
In [5]:
import plotly.graph_objects as go
from plotly.subplots import make_subplots

labels = ['1st', '2nd', '3rd', '4th', '5th']

# Define color sets of paintings
night_colors = ['rgb(56, 75, 126)', 'rgb(18, 36, 37)', 'rgb(34, 53, 101)',
                'rgb(36, 55, 57)', 'rgb(6, 4, 4)']
sunflowers_colors = ['rgb(177, 127, 38)', 'rgb(205, 152, 36)', 'rgb(99, 79, 37)',
                     'rgb(129, 180, 179)', 'rgb(124, 103, 37)']
irises_colors = ['rgb(33, 75, 99)', 'rgb(79, 129, 102)', 'rgb(151, 179, 100)',
                 'rgb(175, 49, 35)', 'rgb(36, 73, 147)']
cafe_colors =  ['rgb(146, 123, 21)', 'rgb(177, 180, 34)', 'rgb(206, 206, 40)',
                'rgb(175, 51, 21)', 'rgb(35, 36, 21)']

# Create subplots, using 'domain' type for pie charts
specs = [[{'type':'domain'}, {'type':'domain'}], [{'type':'domain'}, {'type':'domain'}]]
fig = make_subplots(rows=2, cols=2, specs=specs)

# Define pie charts
fig.add_trace(go.Pie(labels=labels, values=[38, 27, 18, 10, 7], name='Starry Night',
                     marker_colors=night_colors), 1, 1)
fig.add_trace(go.Pie(labels=labels, values=[28, 26, 21, 15, 10], name='Sunflowers',
                     marker_colors=sunflowers_colors), 1, 2)
fig.add_trace(go.Pie(labels=labels, values=[38, 19, 16, 14, 13], name='Irises',
                     marker_colors=irises_colors), 2, 1)
fig.add_trace(go.Pie(labels=labels, values=[31, 24, 19, 18, 8], name='The Night Café',
                     marker_colors=cafe_colors), 2, 2)

# Tune layout and hover info
fig.update_traces(hoverinfo='label+percent+name', textinfo='none')
fig.update(layout_title_text='Van Gogh: 5 Most Prominent Colors Shown Proportionally',
           layout_showlegend=False)

fig = go.Figure(fig)
fig.show()

Plot chart with area proportional to total count

Plots in the same scalegroup are represented with an area proportional to their total size.

In [6]:
import plotly.graph_objects as go
from plotly.subplots import make_subplots

labels = ["Asia", "Europe", "Africa", "Americas", "Oceania"]

fig = make_subplots(1, 2, specs=[[{'type':'domain'}, {'type':'domain'}]],
                    subplot_titles=['1980', '2007'])
fig.add_trace(go.Pie(labels=labels, values=[4, 7, 1, 7, 0.5], scalegroup='one',
                     name="World GDP 1980"), 1, 1)
fig.add_trace(go.Pie(labels=labels, values=[21, 15, 3, 19, 1], scalegroup='one',
                     name="World GDP 2007"), 1, 2)

fig.update_layout(title_text='World GDP')
fig.show()

Dash Example

Dash is an Open Source Python library which can help you convert plotly figures into a reactive, web-based application. Below is a simple example of a dashboard created using Dash. Its source code can easily be deployed to a PaaS.

In [7]:
from IPython.display import IFrame
IFrame(src= "https://dash-simple-apps.plotly.host/dash-pieplot", width="100%", height="650px" ,frameBorder="0")
Out[7]:
In [8]:
from IPython.display import IFrame
IFrame(src= "https://dash-simple-apps.plotly.host/dash-pieplot/code", width="100%", height=500 ,frameBorder="0")
Out[8]:

Reference

See https://plot.ly/python/reference/#pie for more information and chart attribute options!