metaclass keyword argumentof class definitions metaclass keyword argumentof class definitions _metaclass_ attributeof classes migrating code python to practical strategy _metaclass_ global variable mimeapplication classemail package metaclasses mimeaudio classemail package _prepare_ (method - and descriptors and inheritance caution on use example of how to define performance benefits use of _new_ (method use of custom dictionary object method resolution orderand typeerror exception method resolution _mro_ attribute multiple inheritance single inheritance methodcaller(functionoperator module methodhelp(methodof serverproxy objects methods bound calling process class @classmethod decorator defining in classes definition of handling as properties preventing redefinition in subclasses static @staticmethod decorator type of type of built-in unbound use of super(function mimeimage classemail package mimemessage classemail package mimemultipart classemail package mimetext classemail package mimetypes module min attribute of date class of datetime class of sys float_info of time class of timedelta class min(function - on sets required methods for user-defined objects min_ _exp attributeof sys float_info min_exp attributeof sys float_info minimum requirements for supporting equality minor(functionos module minute attributeof time objects mirrored(functionunicodedata module missing parentheseseand tuples mixed-type mathematical operations - mixin classes mixing byte strings and unicode mkd(methodof ftp objects mkdir(functionos module mkdtemp(functiontempfile module mkfifo(functionos module mknod(functionos module mkstemp(functiontempfile module methodsignatures(methodof serverproxy objects mktemp(functiontempfile module methodtype type - mmap module microsecond attributeof time objects mmap(functionmmap module microthreading mod(functionoperator module mktime(functiontime module lib fl ff