docstring

A string literal which appears as the first expression in a class,

function or module. While ignored when the suite is executed, it is

recognized by the compiler and put into the:attr:`__doc__` attribute

recognized by the compiler and put into the:attr:`!__doc__` attribute

of the enclosing class, function or module. Since it is available via

introspection, it is the canonical place for documentation of the

object.

The:class:`collections.abc.Sequence` abstract base class

defines a much richer interface that goes beyond just

:meth:`~object.__getitem__` and:meth:`~object.__len__`, adding

:meth:`count`,:meth:`index`,:meth:`~object.__contains__`, and

:meth:`!count`,:meth:`!index`,:meth:`~object.__contains__`, and

:meth:`~object.__reversed__`. Types that implement this expanded

interface can be registered explicitly using

:func:`~abc.ABCMeta.register`.

:func:`~abc.ABCMeta.register`. For more documentation on sequence

methods generally, see

:ref:`Common Sequence Operations<typesseq-common>`.

set comprehension

A compact way to process all or part of the elements in an iterable and