Optional parens for python tuples, what's the difference?

so_python_tuples_parens

#!/usr/bin/env python
from __future__ import print_function
import dis

def assign_no_paren_const(a, b):
    x = 1, 2

def assign_w_paren_const(a, b):
    x = (1, 2)

def assign_no_paren(a, b):
    x = a, b

def assign_w_paren(a, b):
    x = (a, b)

dis.dis(assign_no_paren_const)
dis.dis(assign_w_paren_const)
dis.dis(assign_no_paren)
dis.dis(assign_w_paren)

x = 12 * 4, 5
print(x)
x = 12 * (4, 5)
print(x)

this gist was created as an appendix to this answer to a question on SO regarding tuples with and without parens.