# Program: annotate.py
# Authors: Michael H. Goldwasser
# David Letscher
#
# This example is discussed in Chapter 8 of the book
# Object-Oriented Programming in Python
#
from FileUtilities import openFileReadRobust, openFileWriteRobust
print 'This program annotates a file, by adding'
print 'Line numbers to the left of each line.\n'
source = openFileReadRobust()
annotated = openFileWriteRobust('annotated.txt')
# process the file
linenum = 1
for line in source:
annotated.write('%4d %s' % (linenum, line) )
linenum += 1
source.close()
annotated.close()
print 'The annotation is complete.'
# Program: countLetters.py
# Authors: Michael H. Goldwasser
# David Letscher
#
# This example is discussed in Chapter 8 of the book
# Object-Oriented Programming in Python
#
from FileUtilities import openFileReadRobust, openFileWriteRobust
from TallySheet import TallySheet
print 'This program counts the frequency of letters.'
print 'Only alphabetic characters are considered.\n'
sheet = TallySheet('A', 'Z')
source = openFileReadRobust()
character = 'FAKE' # forces us inside the loop
while character:
character = source.read(1) # read single (ascii) character
if character.isalpha():
sheet.increment(character.upper())
source.close()
tallyfile = openFileWriteRobust('frequencies.txt')
sheet.writeTable(tallyfile)
tallyfile.close()
print 'The tally has been written.'
