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Create PDF control break reports with itertools.groupby and xtopdf (Python recipe) by Vasudev Ram
ActiveState Code (http://code.activestate.com/recipes/580692/)

This recipe shows how to create the classic control break style of report (a staple of data processing) using Python along with the groupby function from the itertools module, and xtopdf, a Python toolkit for PDF creation.

Python, 67 lines
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from __future__ import print_function

# ControlBreakToPDF.py
# A program to show how to write simple control break reports
# and send the output to PDF, using itertools.groupby and xtopdf.
# Author: Vasudev Ram
# Copyright 2016 Vasudev Ram
# http://jugad2.blogspot.com
# https://gumroad.com/vasudevram

from itertools import groupby
from PDFWriter import PDFWriter

# I hard-code the data here to make the example shorter.
# More commonly, it would be fetched at run-time from a 
# database query or CSV file or similar source.

data = \
[
    ['North', 'Desktop #1', 1000],
    ['South', 'Desktop #3', 1100],
    ['North', 'Laptop #7', 1200],
    ['South', 'Keyboard #4', 200],
    ['North', 'Mouse #2', 50],
    ['East', 'Tablet #5', 200],
    ['West', 'Hard disk #8', 500],
    ['West', 'CD-ROM #6', 150],
    ['South', 'DVD Drive', 150],
    ['East', 'Offline UPS', 250],
]

pw = PDFWriter('SalesReport.pdf')
pw.setFont('Courier', 12)
pw.setHeader('Sales by Region')
pw.setFooter('Using itertools.groupby and xtopdf')

# Convenience function to both print to screen and write to PDF.
def print_and_write(s, pw):
    print(s)
    pw.writeLine(s)

# Set column headers.
headers = ['Region', 'Item', 'Sale Value']
# Set column widths.
widths = [ 10, 15, 10 ]
# Build header string for report.
header_str = ''.join([hdr.center(widths[ind]) \
    for ind, hdr in enumerate(headers)])
print_and_write(header_str, pw)

# Function to base the sorting and grouping on.
def key_func(rec):
    return rec[0]

data.sort(key=key_func)

for region, group in groupby(data, key=key_func):
    print_and_write('', pw)
    # Write group header, i.e. region name.
    print_and_write(region.center(widths[0]), pw)
    # Write group's rows, i.e. sales data for the region.
    for row in group:
        # Build formatted row string.
        row_str = ''.join(str(col).rjust(widths[ind + 1]) \
            for ind, col in enumerate(row[1:]))
        print_and_write(' ' * widths[0] + row_str, pw)
pw.close()

Control-break reports are one of the most common kinds of reports in data processing. They are applicable across organization types.

More details and sample output here:

https://jugad2.blogspot.in/2016/07/control-break-report-to-pdf-with-xtopdf.html

Tags: control, database, grouping, iterators, pdf, pdfwriter, pdf_generation, python, reportgeneration, reporting, sql, xtopdf