class csv.Dialect The Dialect class is a container class relied on primarily for its attributes, which are used to define the parameters for a specific reader or writer instance.

class asyncio.ProactorEventLoop Proactor event loop for Windows using “I/O Completion Ports” aka IOCP. Subclass of AbstractEventLoop. Availability: Windows. See also MSDN documentation on I/O Completion Ports.

itertools.cycle(iterable) Make an iterator returning elements from the iterable and saving a copy of each. When the iterable is exhausted, return elements from the saved copy. Repeats indefinitely. Roughly equivalent to: def cycle(iterable): # cycle('ABCD') --> A B C D A B C D A B C D ... saved = [] for element in iterable: yield element saved.append(element) while saved: for element in saved: yield element Note, this member of the to

This module provides direct access to all ‘built-in’ identifiers of Python; for example, builtins.open is the full name for the built-in function open(). See Built-in Functions and Built-in Constants for documentation. This module is not normally accessed explicitly by most applications, but can be useful in modules that provide objects with the same name as a built-in value, but in which the built-in of that name is also needed. For example, in a module that wants to implement an open() functi

AbstractEventLoop.set_exception_handler(handler) Set handler as the new event loop exception handler. If handler is None, the default exception handler will be set. If handler is a callable object, it should have a matching signature to (loop, context), where loop will be a reference to the active event loop, context will be a dict object (see call_exception_handler() documentation for details about context).

sys.__stderr__ These objects contain the original values of stdin, stderr and stdout at the start of the program. They are used during finalization, and could be useful to print to the actual standard stream no matter if the sys.std* object has been redirected. It can also be used to restore the actual files to known working file objects in case they have been overwritten with a broken object. However, the preferred way to do this is to explicitly save the previous stream before replacing it

array.tostring() Deprecated alias for tobytes().

theme_settings(themename, settings) Temporarily sets the current theme to themename, apply specified settings and then restore the previous theme. Each key in settings is a style and each value may contain the keys ‘configure’, ‘map’, ‘layout’ and ‘element create’ and they are expected to have the same format as specified by the methods Style.configure(), Style.map(), Style.layout() and Style.element_create() respectively. As an example, let’s change the Combobox for the default theme a bit:

Popen.args The args argument as it was passed to Popen – a sequence of program arguments or else a single string. New in version 3.3.

BaseCookie.js_output(attrs=None) Return an embeddable JavaScript snippet, which, if run on a browser which supports JavaScript, will act the same as if the HTTP headers was sent. The meaning for attrs is the same as in output().