Getting tuple from command line arguments

Question

Have a question,

I'm writing a python-script and need to pass argument to the script from cmd.

My code to implement this little feature:

import sys

cars = sys.argv[1]

From command line, I type the next command:

python my_script.py ("Opel", "Nissan", 'Reno')

But when I checked the results, it was not a tuple, it was a string. How can I get a tuple from argument?

@Sherzod I have already read this topic, but it doesn't help me, I need a solution for this case — Artsom, Mar 31 '20 at 09:29

user2390182 · Answer 1 · 2020-03-31T09:34:15.827

4

The command line does not know about Python data structures. All you get from there are strings. You can create them in Python, however:

cars = sys.argv[1].split()
# cars = tuple(sys.argv[1].split())

and call script as

python my_script.py "Opel Nissan Reno"

For more advanced argument processing, you should consider using the argparse module.

edited Mar 31 '20 at 09:34

answered Mar 31 '20 at 09:26

user2390182

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I tried your solution, but it doesn't work, I checked cars variable with isinstance method to understand what is the type. – Artsom Mar 31 '20 at 09:35
Did you see my uncommented variant which makes it a `tuple` instead of a `list`. – user2390182 Mar 31 '20 at 09:36

score 0 · Answer 2 · answered Mar 31 '20 at 09:29

0

command line is not define tuple. try this from command line

python my_script.py "Opel" "Nissan" "Reno"

import sys
# get from 1 to end
cars = sys.argv[1:]

answered Mar 31 '20 at 09:29

Muhammet AYAN

1
2

You can see cars with `print(tuple(cars))` – Muhammet AYAN Mar 31 '20 at 11:08

score 0 · Answer 3 · answered Mar 31 '20 at 09:36

How about this:

import argparse

parser = argparse.ArgumentParser()
parser.add_argument('--data', nargs='+', type=str)
args = parser.parse_args()
my_tuple = tuple(args.data)
print(type(my_tuple)) # Check type

Run:

python my_script.py --data Opel Nissan Reno

Output:

<class 'tuple'>

Getting tuple from command line arguments

3 Answers3