class str(object='') class str(object=b'', encoding='utf-8', errors='strict') Return a str version of object. See str() for details. str is the built-in string class. For general information about strings, see Text Sequence Type — str.

operator.__ipow__(a, b) a = ipow(a, b) is equivalent to a **= b.

AbstractEventLoop.create_future() Create an asyncio.Future object attached to the loop. This is a preferred way to create futures in asyncio, as event loop implementations can provide alternative implementations of the Future class (with better performance or instrumentation). New in version 3.5.2.

heapq.merge(*iterables, key=None, reverse=False) Merge multiple sorted inputs into a single sorted output (for example, merge timestamped entries from multiple log files). Returns an iterator over the sorted values. Similar to sorted(itertools.chain(*iterables)) but returns an iterable, does not pull the data into memory all at once, and assumes that each of the input streams is already sorted (smallest to largest). Has two optional arguments which must be specified as keyword arguments. key

signal.sigpending() Examine the set of signals that are pending for delivery to the calling thread (i.e., the signals which have been raised while blocked). Return the set of the pending signals. Availability: Unix (see the man page sigpending(2) for further information). See also pause(), pthread_sigmask() and sigwait(). New in version 3.3.

make_alternative(boundary=None) Convert a non-multipart or a multipart/related into a multipart/alternative, moving any existing Content- headers and payload into a (new) first part of the multipart. If boundary is specified, use it as the boundary string in the multipart, otherwise leave the boundary to be automatically created when it is needed (for example, when the message is serialized).

code.compile_command(source, filename="", symbol="single") This function is useful for programs that want to emulate Python’s interpreter main loop (a.k.a. the read-eval-print loop). The tricky part is to determine when the user has entered an incomplete command that can be completed by entering more text (as opposed to a complete command or a syntax error). This function almost always makes the same decision as the real interpreter main loop. source is the source string; filename is the opt

operator.iconcat(a, b) operator.__iconcat__(a, b) a = iconcat(a, b) is equivalent to a += b for a and b sequences.

class string.Template(template) The constructor takes a single argument which is the template string. substitute(mapping, **kwds) Performs the template substitution, returning a new string. mapping is any dictionary-like object with keys that match the placeholders in the template. Alternatively, you can provide keyword arguments, where the keywords are the placeholders. When both mapping and kwds are given and there are duplicates, the placeholders from kwds take precedence. safe_sub

header_store_parse(name, value) The email package calls this method with the name and value provided by the application program when the application program is modifying a Message programmatically (as opposed to a Message created by a parser). The method should return the (name, value) tuple that is to be stored in the Message to represent the header. If an implementation wishes to retain compatibility with the existing email package policies, the name and value should be strings or string s