qwurx [shmem] ~> python Python 2.7.15+ (default, Nov 27 2018, 23:36:35) [GCC 7.3.0] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> foo = (1,2,3,4) >>> bar = [1,2,3,4] >>> type(foo) >>> type(bar) >>> bar[0] = 5 >>> foo[0] = 5 Traceback (most recent call last): File "", line 1, in TypeError: 'tuple' object does not support item assignment >>> foo (1, 2, 3, 4) >>> bar [5, 2, 3, 4] >>>