os.dup(fd) Return a duplicate of file descriptor fd. The new file descriptor is non-inheritable. On Windows, when duplicating a standard stream (0: stdin, 1: stdout, 2: stderr), the new file descriptor is inheritable. Changed in version 3.4: The new file descriptor is now non-inheritable.

_length_ A positive integer specifying the number of elements in the array. Out-of-range subscripts result in an IndexError. Will be returned by len().

commit() This method commits the current transaction. If you don’t call this method, anything you did since the last call to commit() is not visible from other database connections. If you wonder why you don’t see the data you’ve written to the database, please check you didn’t forget to call this method.

HTTPResponse.getheader(name, default=None) Return the value of the header name, or default if there is no header matching name. If there is more than one header with the name name, return all of the values joined by ‘, ‘. If ‘default’ is any iterable other than a single string, its elements are similarly returned joined by commas.

lock() unlock() Three locking mechanisms are used—dot locking and, if available, the flock() and lockf() system calls.

class typing.Container(Generic[T_co]) A generic version of collections.abc.Container.

ssl.PROTOCOL_TLSv1_2 Selects TLS version 1.2 as the channel encryption protocol. This is the most modern version, and probably the best choice for maximum protection, if both sides can speak it. Available only with openssl version 1.0.1+. New in version 3.4.

_thread.interrupt_main() Raise a KeyboardInterrupt exception in the main thread. A subthread can use this function to interrupt the main thread.

Logger.warning(msg, *args, **kwargs) Logs a message with level WARNING on this logger. The arguments are interpreted as for debug(). Note There is an obsolete method warn which is functionally identical to warning. As warn is deprecated, please do not use it - use warning instead.

InputSource.getCharacterStream() Get the character stream for this input source.