ex16.py

from sys import argv

script, filename = argv

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

input("?")

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

# not needed because we opened the file with 'w'
# print("Truncating the file. Goodbye!")
# target.truncate()

print("Now I'm going to ask you for three lines.")
line1 = input("Line 1: ")
line2 = input("Line 2: ")
line3 = input("Line 3: ")

print("I'm going to write these to the file.")
target.write("{}\n{}\n{}".format(line1, line2, line3))

print("We close it.")
target.close()

print("Let's read it again")
target = open(filename)
print(target.read())
target.close()