stef mientki schrieb: > hello, > > I've written a convenience wrapper around ConfigObj (which is a imporved > ConfigParser). > > Now if I use an instance of the base class, I can easily test is the > instance exists by " if ini:", > like in this example > > ini = None > if ini: > print 'ok',type(ini) > else: > print 'wrong',type(ini) > ini = ConfigObj (filename) > if ini: > print 'ok',type(ini) > else: > print 'wrong',type(ini) > > Now if I derive a new class form this: > class inifile (ConfigObj): > def __init__ (self, filename): > self.ini = ConfigObj ( filename , list_values = False, > write_empty_values = True ) > self.ini.newlines = '\r\n' # not strictly necessary > self.Section = '' > self.Modified = False > > > the test if an instance exists, always returns false. > ini = inifile (filename) > if ini: > print 'ok',type(ini) > else: > print 'wrong',type(ini) > > Why is that ? > What should I do to the same simple test for existance ?
Use isinstance(obj, type). Diez -- http://mail.python.org/mailman/listinfo/python-list
