习题16.md

from sys import argv

script,filename = argv

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

input("?")

print("Opening the file...")
target = open(filename,'w')

print("Truncating the file.Bye")
target.truncate()

print("Now I'm going to ask you for three lines.")

line1 = input("line1:")
line2 = input("line2:")
line3 = input("line3:")

print("I'm going to write these to the file.")

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()