Python XlsxWriter - Pie Chart

A pie chart is a representation of a single data series into a circle, which is divided into slices corresponding to each data item in the series. In a pie chart, the arc length of each slice is proportional to the quantity it represents. In the following worksheet, quarterly sales figures of a product are displayed in the form of a pie chart.

Pie Chart Of Quarterly Sales

Working with XlsxWriter Pie Chart

To generate the above chart programmatically using XlsxWriter, we first write the following data in the worksheet.

headings = ['Category', 'Values']
data = [
   ['Q1', 'Q2', 'Q3', 'Q4'],
   [125, 60, 100, 80],
]
worksheet.write_row('A1', headings, bold)
worksheet.write_column('A2', data[0])
worksheet.write_column('B2', data[1])

A Chart object with type=pie is declared and the cell range B1:D1 is used as value parameter for add_series() method and the quarters (Q1, Q2, Q3 and Q4) in column A are the categories.

chart1.add_series({
   'name': 'Quarterly sales data',
   'categories': ['Sheet1', 1, 0, 4, 0],
   'values': ['Sheet1', 1, 1, 4, 1],
})
chart1.set_title({'name': 'Pie Chart of Quarterly Sales'})

In the pie chart, we can use data_labels property to represent the percent value of each pie by setting percentage=True.

Example

The complete program for pie chart generation is as follows −

import xlsxwriter

wb = xlsxwriter.Workbook('hello.xlsx')
worksheet = wb.add_worksheet()

headings = ['Category', 'Values']
data = [
   ['Q1', 'Q2', 'Q3', 'Q4'],
   [125, 60, 100, 80],
]
bold=wb.add_format({'bold':True})
worksheet.write_row('A1', headings, bold)
worksheet.write_column('A2', data[0])
worksheet.write_column('B2', data[1])

chart1 = wb.add_chart({'type': 'pie'})
chart1.add_series({
   'name': 'Quarterly sales data',
   'categories': ['Sheet1', 1, 0, 4, 0],
   'values': ['Sheet1', 1, 1, 4, 1],
   'data_labels': {'percentage':True},
})
chart1.set_title({'name': 'Pie Chart of Quarterly Sales'})

worksheet.insert_chart('D2', chart1)

wb.close()

Output

Have a look at the pie chart that the above program produces.

Pie Chart Of Quarterly Sales1

Doughnut Chart

The doughnut chart is a variant of the pie chart, with a hole in its center, and it displays categories as arcs rather than slices. Both make part-to-whole relationships easy to grasp at a glance. Just change the chart type to doughnut.

chart1 = workbook.add_chart({'type': 'doughnut'})

The doughnut chart of the data in above example appears as below −

Doughnut Chart
Advertisements