ArgumentParser.parse_args by default takes the arguments simply from sys.argv. So if you don’t change that behavior (by passing in something else to parse_args), you can simply print sys.argv to get all arguments passed to the Python script:
import sys
print(sys.argv)
Alternatively, you could also just print the namespace that parse_args returns; that way you get all values in the way the argument parser interpreted them:
args = parser.parse_args()
print(args)