What's wrong with here? Python2 ->Python3

Question

I'm practicing Python with the book called Learn "Python The Hard Way 3rd edition". I searched that this book is a good resource to get a start.

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)

And I got an error saying that value error: not enough values to unpack (expected 4, got 1).

score 2 · Accepted Answer · answered Aug 17 '17 at 17:30

2

You need to run the script with three arguments, so that argv contains four elements (the first is the script's name).

answered Aug 17 '17 at 17:30

Mureinik

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can you give more examples on this? – Oliver Bird Aug 17 '17 at 17:35
@OliverBird sure: `$ python myscript.py one two three` – Mureinik Aug 17 '17 at 17:45
Thanks. I got my results! – Oliver Bird Aug 17 '17 at 18:39

score 1 · Answer 2 · answered Aug 17 '17 at 18:02

1

argv is a list containing the following: argv[0] is the script pathname if known argv[1], argv[2], argv[3]... contains arguments passed from the shell.

In order for your code to work you need to run it with 3 arguments so that they can be unpacked and assigned to your 4 variables.

answered Aug 17 '17 at 18:02

Vincent J. Michuki

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Thanks, that's helpful as well! – Oliver Bird Aug 17 '17 at 18:39

What's wrong with here? Python2 ->Python3

2 Answers2