python IOError [Errno 13] string vs Tk -

when use tk.askopenfiledialogbox , choose directory want, open each file open(files, "r") works fine. however, when hard code path string access denied ioerror [errno13]. here code:

   data_path = "c:\data\datasubdir"      datadir = [x[0] x in os.walk(data_path)]    dataset in datadir[1:]:         files in glob.glob(dataset):              open(files,'r') dest_f:                   data_iter = c.reader(dest_f,                                         delimiter = ',',                                         quotechar = '"')                    data = [data data in data_iter]                    csv = np.asarray(data, dtype = none) 

i solve out changing permissions. also, if explain why choosing file through tk dialog box gets rid of permission issue awesome (and offer solution too! ).

thanks.

either escape backslashes

data_path = "c:\\data\\datasubdir" 

or use raw string:

data_path = r"c:\data\datasubdir"   

with tk dialog box string in correct format.