return_annotation The “return” annotation for the callable. If the callable has no “return” annotation, this attribute is set

site.getuserbase() Return the path of the user base directory, USER_BASE. If it is not initialized yet, this function

inspect.ismemberdescriptor(object) Return true if the object is a member descriptor.

inspect.isframe(object) Return true if the object is a frame.

@abc.abstractclassmethod A subclass of the built-in

gc.set_threshold(threshold0[, threshold1[, threshold2]]) Set the garbage collection thresholds (the collection frequency). Setting

gc.callbacks A list of callbacks that will be invoked by the garbage collector before and after collection. The callbacks will

warnings.showwarning(message, category, filename, lineno, file=None, line=None) Write a warning to a file. The default implementation

inspect.getgeneratorlocals(generator) Get the mapping of live local variables in generator to their current values

sys._xoptions A dictionary of the various implementation-specific flags passed through the -X command-line option