Procesamiento de textos

# rlcal.py v1.1 (C) 2005 Richard Jones
# Generates 2 PDF pages for a "year planner". Year is hard-coded.
# license: http://creativecommons.org/licenses/by-nc-sa/2.0
# Requires ReportLab PDF library 
import calendar
from reportlab.lib import colors
from reportlab.graphics import shapes, renderPDF

YEAR = 2005

def half_year(startmon):
    '''"startmon" gives the 1-indexed month to start the page on'''
    mons = []
    reqd = 0
    # ask calendar.py to figure the actual days for each month
    for mon in range(6):
        weeks = calendar.monthcalendar(YEAR, mon + startmon)
        weeks[-1] = filter(None, weeks[-1])
        mdays = []
        for week in weeks:
            mdays.extend(week)
        reqd = max(reqd, len(mdays))
        mons.append(mdays)

    LEFTMARGIN = 5
    DAYCOLWIDTH = 50
    CELLWIDTH  = 80
    CELLHEIGHT = 19
    TOPROWHEIGHT = 18
    WIDTH = LEFTMARGIN + DAYCOLWIDTH + CELLWIDTH*6
    HEIGHT = reqd * CELLHEIGHT + TOPROWHEIGHT

    d = shapes.Drawing(WIDTH, HEIGHT)

    # month headings
    for i in range(6):
        x = LEFTMARGIN + i*CELLWIDTH + DAYCOLWIDTH + CELLWIDTH/2
        d.add(shapes.String(x, HEIGHT-14, calendar.month_abbr[i + startmon],
            fontSize=14, fontName='Times-Bold', textAnchor='middle'))

    # day row headings
    for i in range(reqd):
        y = HEIGHT - i*CELLHEIGHT - TOPROWHEIGHT
        d.add(shapes.String(LEFTMARGIN + 10, y-14, calendar.day_abbr[i%7],
            fontSize=14))

    # cells for each day, light grey background if weekend
    lightgrey = colors.HexColor(0xD0D0D0)
    for j in range(6):
        x = LEFTMARGIN + j*CELLWIDTH + DAYCOLWIDTH
        for i in range(reqd):
            if i >= len(mons[j]) or not mons[j][i]: continue
            y = HEIGHT - i*CELLHEIGHT - TOPROWHEIGHT
            color = (i%7 > 4) and lightgrey or colors.white
            d.add(shapes.Rect(x, y, CELLWIDTH, -CELLHEIGHT, fillColor=color))
            d.add(shapes.String(x+1, y-10, str(mons[j][i]), fontSize=10))
    return d

if __name__ == '__main__':
    renderPDF.drawToFile(half_year(1), 'calendar.jan-jun.pdf')
    renderPDF.drawToFile(half_year(7), 'calendar.jul-dec.pdf')

Partiendo de la receta de Raymond Hettinger que he visto comentada en PythonHispano, la he mejorado para hacerla un poco más flexible para que se puedan usar caracteres alfanuméricos según Unicode, y ya de paso la he cambiado para que haga de paso las sustituciones en la plantilla.

import re

def convert_template(template, subst=None, opener='[', closer=']'):
    opener = re.escape(opener)
    closer = re.escape(closer)
    pattern = re.compile(opener + '([- \w]+)' + closer, re.UNICODE)
    
    if subst:
        repl=lambda m: subst.get(m.group(1),m.group(0))
    else:
        repl=r'%(\1)s'
    
    return re.sub(pattern, repl, template)

print convert_template('Mi dirección es [Dirección Postal].',{'Dirección Postal':'Percebe Rue, 13'})