class typing.MappingView(Sized, Iterable[T_co]) A generic version of collections.abc.MappingView.

os.unsetenv(key) Unset (delete) the environment variable named key. Such changes to the environment affect subprocesses started with os.system(), popen() or fork() and execv(). When unsetenv() is supported, deletion of items in os.environ is automatically translated into a corresponding call to unsetenv(); however, calls to unsetenv() don’t update os.environ, so it is actually preferable to delete items of os.environ. Availability: most flavors of Unix, Windows.

CookiePolicy.path_return_ok(path, request) Return false if cookies should not be returned, given cookie path. See the documentation for domain_return_ok().

exception xml.sax.SAXNotRecognizedException(msg, exception=None) Subclass of SAXException raised when a SAX XMLReader is confronted with an unrecognized feature or property. SAX applications and extensions may use this class for similar purposes.

iter_unpack(buffer) Identical to the iter_unpack() function, using the compiled format. The buffer’s size in bytes must be a multiple of size. New in version 3.4.

msvcrt.ungetwch(unicode_char) Wide char variant of ungetch(), accepting a Unicode value.

xml.sax.handler.all_features List of all features.

class tkinter.tix.NoteBook The NoteBook widget can be used to display many windows in a limited space using a notebook metaphor. The notebook is divided into a stack of pages. At one time only one of these pages can be shown. The user can navigate through these pages by choosing the visual “tabs” at the top of the NoteBook widget.

devpoll.closed True if the polling object is closed. New in version 3.4.

xmlparser.CurrentColumnNumber Current column number in the parser input.