Execution error when Passing arguments to a python script using os.system. The script takes sys.argv arguments

#!/bin/bash

export PYTHONPATH=lib64/python/side-packages
./command.py "$@"

import sys

if __name__=="__main__":
    print "command arguments:", sys.argv 

$ python 1.py arg1 arg2 
command arguments: ['1.py', 'arg1', 'arg2']
$ python 1.py
command arguments: ['1.py']

import sys

if __name__ == '__main__':
    try:
        arg_command = sys.argv[1]
    except IndexError:
        arg_command = ""

    Done = False
    while not Done:
        if arg_command=="":
            print('\nMenu')
            print('C Clear All')
            print('L Load Encrypted File')
            print('Q Quit')
            print('----------------')
            print('Enter Choice>')
            command = raw_input('Enter Selection> ').strip()[0].upper()
        else:
            command = arg_command
            #- set arg value to empty to run Menu option again.
            arg_command = ""

        if command == 'C':
            print "In Clear All event."
        elif command == 'L':
            print "In Clear All event."
        elif command == "Q":
            break
        else:
            print "Wrong Selection."

$ python 1.py C
In Clear All event.

Menu
C Clear All
L Load Encrypted File
Q Quit
----------------
Enter Choice>
Enter Selection> q
$ 

$ python 1.py

Menu
C Clear All
L Load Encrypted File
Q Quit
----------------
Enter Choice>
Enter Selection> l
In Clear All event.

Menu
C Clear All
L Load Encrypted File
Q Quit
----------------
Enter Choice>
Enter Selection> q
$ 

args = '-b testscene.blend --python localrender.py -- -start 1 -type diffuse -samples 100'
iter = (i for i in args.split(' '))

args_dict = {'part1': {}, 'part2': {}}
current_part = 'part1'
for chunk in iter:
    if chunk == '--':
        current_part = 'part2'
        continue
    if chunk.startswith('-'):
        args_dict[current_part][chunk.lstrip('-')] = next(iter)

print(args_dict)

{'part1': {'b': 'testscene.blend', 'python': 'localrender.py'},
 'part2': {'samples': '100', 'start': '1', 'type': 'diffuse'}}

exec(open("./sim_gen.py 100 .3").read())

f = open("./sim_gen.py 100 .3")
contents = f.read()
exec(contents)

import subprocess
import sys
subprocess.run([sys.executable, "./sim_gen.py", "100", ".3"])

import sys
_argv = sys.argv
try:
    sys.argv = ["./sim_gen.py", "100", ".3"]
    with open("./sim_gen.py 100 .3"):
        exec(f.read())
finally:
    sys.argv = _argv