convert external arguments into list

Question

I need to run a script with external arguments where first argument should be a int the second an list : example :

python run_eval_ML.py 5 "(2,4,6,8)"

When I run the script I get :

(base) MyPC:ML$ python run_eval_ML.py 5 "(2,4,5,8)" 
run_eval_ML.py 
5 
(2,4,5,8) 
param_grid {'n_neighbors': '(2,4,5,8)'}

# First ARGV: 5 : OK

But The second argument should be this type : (2,4,5,8) and not '(2,4,5,8)'

When I assign

var2=sys.argv[2]

and I re assign

param_grid = {'n_neighbors':var2}

I get

param_grid {'n_neighbors': '(2,4,5,8)'}

and not

param_grid {'n_neighbors': (2,4,5,8)}

Thank you in advance if you can help

Rgds Carlos

system sends all as string so run with "2,4,5,8" and use sys.argv[2] .split(',') to create list. If you need numbers then you have to convert to integer var2 = [int(x) for x in sys.argv[2] .split(',')] or var2 = list(map(int, sys.argv[2] .split(','))) — furas
– furas, Commented Aug 4, 2019 at 21:11
BTW: first argument is string "5" not integer 5 so you may have to convert it too. — furas
– furas, Commented Aug 4, 2019 at 21:13

furas · Accepted Answer · 2019-08-04 21:17:34Z

1

System sends all as strings so you have to split it to list and convert every element to integer

Run without ()

python run_eval_ML.py 5 "2,4,5,8"

and then

# split to list of strings
var2 = sys.argv[2].split(",")

# convert to list of integers
var2 = [int(x) for x in var2]

or in one line

var2 = [int(x) for x in sys.argv[2].splti(",")]

or using map()

var2 = list(map(int, sys.argv[2].splti(",")))

You have also convert first argument from string to integer

var1 = int(sys.argv[1])

answered Aug 4, 2019 at 21:17

furas

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