import sys


class Test(object):
    def __init__(self):
        self._msg = "haha"
        
    def msg(self):
        return self._msg
    
    
def classe(txt):
    try:
        retour = getattr(sys.modules[__name__], txt)
    except:
        retour = None
    return retour
    
t = "Test"

tt = classe(t)()
print tt.msg()