Using sys

https://docs.python.org/3/library/sys.html

INTRODUCTION

This module provides access to some objects used or maintained by the interpreter and to functions that interact strongly with the interpreter.

import sys

# Dynamic objects (selected).

sys.argv   # command line arguments; argv[0] is the script pathname if known
sys.path   # module search path (a list of strings)
# sys.path[0] is the script directory, else ''
sys.modules   # dictionary of loaded modules

sys.stdin   # standard input file object
sys.stdout   # standard output file object
sys.stderr   # standard error object; used for error messages

# Static objects (selected).

sys.executable   # absolute path of the executable binary of the Python interpreter
sys.maxint   # the largest supported integer
sys.version   # the version of this interpreter as a string
sys.platform   # platform identifier
sys.prefix   # prefix used to find the Python library

# Functions (selected).

sys.exit()   #  exit the interpreter by raising SystemExit
# sys.exit(0) is a success, sys.exit(1) is a failure
sys.getrefcount()   # return the reference count for an object (plus one :-)
sys.getrecursionlimit()   # return the max recursion depth for the interpreter
sys.getsizeof()   # return the size of an object in bytes
sys.setrecursionlimit()   # set the max recursion depth for the interpreter

EXAMPLES

#!/usr/bin/python
# script.py

import sys

print(sys.argv)

$ ./script.py 12 34
['./script.py', '12', '34']

$ python3 script.py 12 34
['script.py', '12', '34']