Missing 3 required positional argument with sys.argv[]

I have a problem with a python script I call from a Jenkins pipeline. In the main script I have this:

import sys

authentication = sys.argv[1]
style = sys.argv[2]
ip = sys.argv[3]
accounting = sys.argv[4]

PrintTestCases([str(authentication), str(style), str(ip), str(accounting)])

The function PrintTestCases is in another file and use a match-case structure

def PrintTestCases(authentication, style, ip, accounting):
    match accounting:
        case "NOACC":
            match [authentication, style, ip]:
               case ['NONE', 'NONE', 'NONE']:
                    print("Test Case Number 1")
                case _:
                        print("Wrong Test Case")
        case "ACC":
              match [authentication, style, ip]:
                case ['PRIVATE', 'NONE', 'NONE']:
                    print( "Test Case Number 2")
                case _:
                        print("Wrong Test Case")

Then I call the main script from a Jenkins pipeline like this

python3 -u main NONE NONE NONE ACC

But I always get this error

PrintTestCases() missing 3 required positional arguments: 'style', 'ip', and 'accounting'

Based on my understanding, I am passing the argument to the function via the sys.argv Why the function does not see the required arguments?

You are passing a list that contains all the arguments. Note how these two differ.

PrintTestCases([str(authentication), str(style), str(ip), str(accounting)])

and

PrintTestCases(str(authentication), str(style), str(ip), str(accounting))

In the first case, you're passing a single object. Use the second.

PrintTestCases is expecting 4 distinct arguments, but by passing [str(authentication), str(style), str(ip), str(accounting)] you're actually giving this list as the authentication argument alone, with the others unfilled.