我目前正在学习困难的方式学习Python。我认为该示例可能已过时，因此我想在此获得反馈。

我正在使用Python 3.1

from sys import argv

script, first, second, third = argv

print("the script is called:", (script))
print("your first variable is:", (first))
print("your second variable is:", (second))
print("your third variable is:", (third))

我收到此错误：

Traceback (most recent call last):
  File "/path/ch13.py", line 3, in <module>
    script, first, second, third, bacon = argv
ValueError: need more than 1 value to unpack

知道有什么问题吗？