LPTHW Ex16 ..脚本正在运行但文本文件未更新

Question

我正在运行来自LPTHW的Ex16脚本，脚本运行良好直到最后（包括我写入3行的输入），但文本文件没有得到更新。可能的原因是什么？我在Python3上运行这个脚本。

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.")

input("?")

print ("Opening the file...")
target = open(filename,'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(line1)
target.write("\n")
target.write(line2)
target.write("\n")
target.write(line3)
target.write("\n")
print ("And finally, we close it.")
target.close()