Help with script - Printable Version +- Python Forum (https://python-forum.io) +-- Forum: Python Coding (https://python-forum.io/forum-7.html) +--- Forum: General Coding Help (https://python-forum.io/forum-8.html) +--- Thread: Help with script (/thread-10480.html) |
Help with script - oldDog - May-22-2018 I have just started to learn Python and i bought the book 'Learn Python 3 the Hard Way'. Well every thing was fine until i came to exercise 13 and it was called Parameters, Unpacking, Variables. All i had to do was copy the following: from sys import argv script, first, second, third = argv print("The script is called:", script) print("The first variable is:", first) print("The second variable is:", second) print("The third variable is:", third)Save it as ex13.py and then run it. I used the Atom text editor. But no matter what or how many times i've checked and re-checked i always get an error message when i run it. The error message is as follows: $ oldDog@-linux-desktop:~$ python3.6 ~/python_scripts/ex13.py File "/home/oldDog/python_scripts/ex13.py", line 3, in <module> script, first, second, third = argv ValueError: not enough values to unpack (expected 4, got 1) $ oldDog@-linux-desktop:~$ Could someone please show me what i've done wrong. Big thanks RE: Help with script - snippsat - May-22-2018 sys.argv is a way to get command line arguments into python.ex13.py 1 2 3 should do it.Test: λ python foo.py 1 2 3 The script is called: foo.py The first variable is: 1 The second variable is: 2 The third variable is: 3Or string: λ python foo.py hello world car The script is called: foo.py The first variable is: hello The second variable is: world The third variable is: car sys.argv is the simplest version of this,argparse is in standard library.There also many 3-part librarians for this Click(my favorite),Dotcop,Fire ect... RE: Help with script - oldDog - May-29-2018 Hi snippsat Big thanks for the help |