Example: Pie Chart

#######################################################################
#
# An example of creating Excel Pie charts with Python and XlsxWriter.
#
# The demo also shows how to set segment colors. It is possible to
# define chart colors for most types of XlsxWriter charts
# via the add_series() method. However, Pie/Doughnut charts are a special
# case since each segment is represented as a point so it is necessary to
# assign formatting to each point in the series.
#
# Copyright 2013-2019, John McNamara, jmcnamara@cpan.org
#
import xlsxwriter

workbook = xlsxwriter.Workbook('chart_pie.xlsx')

worksheet = workbook.add_worksheet()
bold = workbook.add_format({'bold': 1})

# Add the worksheet data that the charts will refer to.
headings = ['Category', 'Values']
data = [
    ['Apple', 'Cherry', 'Pecan'],
    [60, 30, 10],
]

worksheet.write_row('A1', headings, bold)
worksheet.write_column('A2', data[0])
worksheet.write_column('B2', data[1])

#######################################################################
#
# Create a new chart object.
#
chart1 = workbook.add_chart({'type': 'pie'})

# Configure the series. Note the use of the list syntax to define ranges:
chart1.add_series({
    'name':       'Pie sales data',
    'categories': ['Sheet1', 1, 0, 3, 0],
    'values':     ['Sheet1', 1, 1, 3, 1],
})

# Add a title.
chart1.set_title({'name': 'Popular Pie Types'})

# Set an Excel chart style. Colors with white outline and shadow.
chart1.set_style(10)

# Insert the chart into the worksheet (with an offset).
worksheet.insert_chart('C2', chart1, {'x_offset': 25, 'y_offset': 10})

#######################################################################
#
# Create a Pie chart with user defined segment colors.
#

# Create an example Pie chart like above.
chart2 = workbook.add_chart({'type': 'pie'})

# Configure the series and add user defined segment colors.
chart2.add_series({
    'name': 'Pie sales data',
    'categories': '=Sheet1!$A$2:$A$4',
    'values':     '=Sheet1!$B$2:$B$4',
    'points': [
        {'fill': {'color': '#5ABA10'}},
        {'fill': {'color': '#FE110E'}},
        {'fill': {'color': '#CA5C05'}},
    ],
})

# Add a title.
chart2.set_title({'name': 'Pie Chart with user defined colors'})

# Insert the chart into the worksheet (with an offset).
worksheet.insert_chart('C18', chart2, {'x_offset': 25, 'y_offset': 10})

#######################################################################
#
# Create a Pie chart with rotation of the segments.
#

# Create an example Pie chart like above.
chart3 = workbook.add_chart({'type': 'pie'})

# Configure the series.
chart3.add_series({
    'name': 'Pie sales data',
    'categories': '=Sheet1!$A$2:$A$4',
    'values':     '=Sheet1!$B$2:$B$4',
})

# Add a title.
chart3.set_title({'name': 'Pie Chart with segment rotation'})

# Change the angle/rotation of the first segment.
chart3.set_rotation(90)

# Insert the chart into the worksheet (with an offset).
worksheet.insert_chart('C34', chart3, {'x_offset': 25, 'y_offset': 10})

workbook.close()