Python에서 변수 체크

isinstance 를 쓰면 될텐데..

용도가 좀 틀리려나.. :?:

질문하신 것과는 좀 다르지만 변수의 존재여부를 조사하는데는 globals와 함께 locals나 dir도 함께 쓰시면 유용하실 겁니다.

locals는 globals와 똑같이 dict 형태로 local namespace를 보여주는 거구요.
dir의 경우는 class, instance, module에 쓰시면 됩니다.

class theclass:
  def __init__(self):
    self.s = 'Hello World !'
  def printt(self):
    print self.s
  def info(self):
    t = 'local hero'
    print 'globals in theclass:\n%s\n' % globals()
    print 'locals  in theclass:\n%s\n' % locals()

if (__name__ == '__main__'):
  print 'globals in __main__:\n%s\n' % globals()
  print 'locals  in __main__:\n%s\n' % locals()
  c = theclass()
  c.printt()
  print
  c.info()
  print 'dir of the class:\n%s\n' % dir (theclass)
  print 'dir of the instance:\n%s\n' % dir (c)

  print "Now you enter the darkside of Python :)"
  c.u = "What's up !?"
  def f (some):
    print some.u
  theclass.printu = f
  print 'dir of the class:\n%s\n' % dir (theclass)
  print 'dir of the instance:\n%s\n' % dir (c)
  c.printu()

이 코드를 실행시켜 보면

$ python theclass.py
globals in __main__:
{'__builtins__': <module '__builtin__' (built-in)>, '__name__': '__main__', '__d
oc__': None, 'theclass': <class __main__.theclass at 0x10110fc0>}

locals  in __main__:
{'__builtins__': <module '__builtin__' (built-in)>, '__name__': '__main__', '__d
oc__': None, 'theclass': <class __main__.theclass at 0x10110fc0>}

Hello World !

globals in theclass:
{'__builtins__': <module '__builtin__' (built-in)>, '__name__': '__main__', 'c':
 <__main__.theclass instance at 0x100c5d08>, '__doc__': None, 'theclass': <class
 __main__.theclass at 0x10110fc0>}

locals  in theclass:
{'self': <__main__.theclass instance at 0x100c5d08>, 't': 'local hero'}

dir of the class:
['__doc__', '__init__', '__module__', 'info', 'printt']

dir of the instance:
['__doc__', '__init__', '__module__', 'info', 'printt', 's']

Now you enter the darkside of Python :)
dir of the class:
['__doc__', '__init__', '__module__', 'info', 'printt', 'printu']

dir of the instance:
['__doc__', '__init__', '__module__', 'info', 'printt', 'printu', 's', 'u']

What's up !?

이런 식이 됩니다. 끝부분은 사용해서는 안될 python의 어두운 측면
:wink: