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

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

inspect.isclass(object) Return true if the object is a class, whether built-in or created in Python code.

empty A special class-level marker to specify absence of default values and annotations.

sys.__interactivehook__ When this attribute exists, its value is automatically called (with no arguments) when the interpreter

inspect.getframeinfo(frame, context=1) Get information about a frame or traceback object. A named

@abc.abstractstaticmethod A subclass of the built-in

inspect.getcallargs(func, *args, **kwds) Bind the args and kwds to the argument names of the Python function

sys.hexversion The version number encoded as a single integer. This is guaranteed to increase with each version, including proper

sys.hash_info A struct sequence giving parameters of the numeric hash implementation