write_in_file_script.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')

print("Truncating the file. Goodbey!")
target.truncate()

print("Now I', 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 there to the file.")

target.write(line1)
target.write('\n')
target.write(line2)
target.write('\n')
target.write(line3)

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