ex16.py

from sys import argv

script, filename = argv

print "We're going to erase %r." % filename
print "If you don't want that, hit CTRL-C (^C)."
print "If you do want that, hit RETURN."

raw_input("?")

# open the file for writing -w.
print "Opening the file..."
target = open(filename, 'w')

# truncate the file
print "Truncating the file.  Goodbye!"
target.truncate()

# ask for input
print "Now I'm going to ask you for three lines."

line1 = raw_input("line 1: ")
line2 = raw_input("line 2: ")
line3 = raw_input("line 3: ")

print "I'm going to write these to a file."

#target.write(line1)
#target.write("\n")
#target.write(line2)
#target.write("\n")
#target.write(line3)
#target.write("\n")

# It's more efficient to do it this way.
target.write(line1 + "\n" + line2 + "\n" + line3 + "\n")

# close the file.
print "And finally, we close it."
target.close()