class xml.etree.ElementTree.TreeBuilder(element_factory=None) Generic element structure builder. This builder converts a sequence of start, data, and end method calls to a well-formed element structure. You can use this class to build an element structure using a custom XML parser, or a parser for some other XML-like format. element_factory, when given, must be a callable accepting two positional arguments: a tag and a dict of attributes. It is expected to return a new element instance. clo

class selectors.DefaultSelector The default selector class, using the most efficient implementation available on the current platform. This should be the default choice for most users.

readlines(hint=-1) Read and return a list of lines from the stream. hint can be specified to control the number of lines read: no more lines will be read if the total size (in bytes/characters) of all lines so far exceeds hint. Note that it’s already possible to iterate on file objects using for line in file: ... without calling file.readlines().

extendleft(iterable) Extend the left side of the deque by appending elements from iterable. Note, the series of left appends results in reversing the order of elements in the iterable argument.

tzinfo.utcoffset(dt) Return offset of local time from UTC, in minutes east of UTC. If local time is west of UTC, this should be negative. Note that this is intended to be the total offset from UTC; for example, if a tzinfo object represents both time zone and DST adjustments, utcoffset() should return their sum. If the UTC offset isn’t known, return None. Else the value returned must be a timedelta object specifying a whole number of minutes in the range -1439 to 1439 inclusive (1440 = 24*60

threading.settrace(func) Set a trace function for all threads started from the threading module. The func will be passed to sys.settrace() for each thread, before its run() method is called.

from_buffer_copy(source[, offset]) This method creates a ctypes instance, copying the buffer from the source object buffer which must be readable. The optional offset parameter specifies an offset into the source buffer in bytes; the default is zero. If the source buffer is not large enough a ValueError is raised.

get_info() Return a string containing the “info” for a message. This is useful for accessing and modifying “info” that is experimental (i.e., not a list of flags).

multiprocessing.connection.answer_challenge(connection, authkey) Receive a message, calculate the digest of the message using authkey as the key, and then send the digest back. If a welcome message is not received, then AuthenticationError is raised.

os.setresuid(ruid, euid, suid) Set the current process’s real, effective, and saved user ids. Availability: Unix. New in version 3.2.