upside-hint.py

#!/usr/bin/env python
#
# Initial hint for exercise to write file in reverse order of lines
# Author:  Yotam Medini  [email protected] -- Created: 2005/October/10
#

# Check for 2 parameters
if len(sys.argv) != 3:
    sys.stderr.write("I should be called with 2 parameters!\n")
    sys.stderr.write("Usage:  %s <oldfile> <newfile>\n" % sys.argv[0])
    sys.exit(1)

# Open files
fold = open(sys.argv[1], 'r') # open for read
fnew = open(sys.argv[2], 'w') # open for write

lines = []
line = fold.readline()
while line != '': # we did not finish reading
    lines = lines + [line]
    line = fold.readline()

# Ok, enough with the hint,     !!!!!!!!!!!!!!!!!!!!
# Now you, yes YOU, do the rest !!!!!!!!!!!!!!!!!!!!
# ..........
# ..........


fold.close()
fnew.close()
sys.exit(0)