Not Tom Eastmanby Not Katie McLaughlin

class TomEastman(object): def whoami(self): return 'Tom Eastman’

tom_eastman = TomEastman()

print(tom_eastman.whoami())

Tom Eastman

class KatieMcLaughlin(object): def whoami(self): return 'Katie McLaughlin’

katie_mclaughlin = KatieMcLaughlin()

print(katie_mclaughlin.whoami())

Katie McLaughlin

if not tom_eastman: print('not Tom Eastman') else: print('Tom Eastman')

Tom Eastman

if not TomEastman: print('not Tom Eastman') else: print('Tom Eastman')

Tom Eastman

if katie_mclaughlin is not tom_eastman: print('Katie is not Tom') else: print('Katie is Tom')

Katie is not Tom

if katie_mclaughlin is not katie_mclaughlin: print('Katie is not Katie') else: print('Katie is Katie')

Katie is Katie

if not isinstance(katie_mclaughlin, TomEastman): print('Katie McLaughlin') else: print('not Katie McLaughlin')

Katie McLaughlin

from wrapt import ObjectProxy

class KatieMcLaughlin(ObjectProxy): pass

tom_eastman = TomEastman() katie_mclaughlin = KatieMcLaughlin(tom_eastman)

print(tom_eastman.whoami())

print(katie_mclaughlin.whoami())

Tom Eastman

Tom Eastman

if isinstance(katie_mclaughlin, TomEastman): print('Tom Eastman') else: print('not Tom Eastman')

Tom Eastman

if isinstance(katie_mclaughlin, KatieMcLaughlin): print('Katie McLaughlin') else: print('not Katie McLaughlin')

Katie McLaughlin

if type(katie_mclaughlin) == TomEastman: print('Tom Eastman') else: print('not Tom Eastman')

not Tom Eastman

What have we learnt?

More than one way to skin a cat

not

== !=

is is not

isinstance() type() __class__

__bool__() __int__()

id()

class GrahamDumpleton(object): def whoami(self): return 'Graham Dumpleton'

graham_dumpleton = GrahamDumpleton()

print(not isinstance(graham_dumpleton, (TomEastman, KatieMcLaughlin)))

True