python containers:

tuple - immutable sequence : (2,3)    tulpe ('ciao')
list  - mutable sequence: [2,3]  list('ciao')
set / frozenset : set() set ((23,)) set ('ciao')
dict map key-value: {2:3}, {4:5,6:7} dict(ci='oo')

All Containers support :
len(c)
iteration : for x in c
membership: if x in c

more...