python - Obtaining object reference for a method using getattr -

python - Obtaining object reference for a method using getattr -

say, have next class called test method called start

>>> class test: ... def __init__(self, *args, **kwargs): ... pass ... def start(self): ... pass ...

now, have standalone independent function called func

>>> def func(): ... print 'this func , not method!!!' ... >>>

[1] now, t.start method of instance of __main__.test belong 0xb769678c

>>> t = test() >>> t.start <bound method test.start of <__main__.test instance @ 0xb769678c>> >>>

[2] func function belong location 0xb767ec6c

>>> func <function func @ 0xb767ec6c> >>>

now, can extract __module__ t.start , func using builtin __module__. not surprisingly, func , t.start belong same module i.e. __main__

>>> func.__module__ '__main__' >>> t.__module__ '__main__' >>>

[3] now, lets store __module__ t.start in variable obj

>>> obj = __import__(t.start.__module__) >>> obj <module '__main__' (built-in)> >>>

now, utilize getattr() func handle <function func @ 0xb767ec6c> function func follows , output of getattr() identical [2]

>>> print getattr(obj, 'func') <function func @ 0xb767ec6c> >>> >>> print getattr(__import__('__main__'), 'func') <function func @ 0xb767ec6c> >>> question:

how utilize getattr() , module name [3] handle of test.start [1] should <bound method test.start of <__main__.test instance @ 0xb769678c>>

when tried using getattr() on 't.start' got next traceback

>>> print getattr(obj, 'test.start') traceback (most recent phone call last): file "<stdin>", line 1, in <module> attributeerror: 'module' object has no attribute 'test.start' >>> >>> >>> print getattr(__import__('__main__'), 'test.start') traceback (most recent phone call last): file "<stdin>", line 1, in <module> attributeerror: 'module' object has no attribute 'test.start' >>>

in other words, have 2 info me.

__import__('__main__') the sting 'test.start'

now, how handle t.start (note instance here) should <bound method test.start of <__main__.test instance @ 0xb769678c>>

i'm not sure if understand question(s), think want:

class test: def __init__(self, *args, **kwargs): pass def start(self): pass def func(): print 'this func , not method!!!' t = test() module = __import__(t.start.__module__) print vars(module)['test'].start print vars(module)['func'] print vars(module)['t'].start

output:

class="lang-none prettyprint-override"><unbound method test.start> <function func @ 0x00ba67f0> <bound method test.start of <__main__.test instance @ 0x00bac170>>

python function object reference getattr