ex16.py

#reading & writting
from sys import argv
script, filename = argv

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

raw_input("?")

print "Opening the file..."
target = open(filename, 'w')
print "Truncate the file. Goodbye!"
target.truncate()

print "Now I'm going to ask you 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 the file"

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

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

new_target=open(filename)
print "Contents of %r"% filename
print new_target.read()