`Iterable` vs. `Sequence`

iterable sequence typing abc

Source

• Python stdlib code (_collections_abc.py)

• Iterable is more general
  • supports only __iter__()
• Sequence inherits Iterable (indirectly via Collection)
  • is in addition Reversible (supports __reversed__)
  • Collection inherits Sized, Iterable and Container
    • supports __len__() (from Sized)
    • supports __iter__() (from Iterable)
    • supports __contains__() (from Container)
  • tuple and str are two examples of concrete subclasses of Sequence