import sys

cml = sys.argv[1]

var = eval(cml)
print(var, type(var))

"""
Terminal> python objects_cml.py 8
8 <class 'int'>
Terminal> python objects_cml.py 8.0
8.0 <class 'float'>
Terminal> python objects_cml.py [1,2,3]
[1, 2, 3] <class 'list'>
Terminal> python objects_cml.py "(1,2,3)"
(1, 2, 3) <class 'tuple'>
Terminal> python objects_cml.py "'(1,2,3)'"
(1,2,3) <class 'str'>
"""