# Import system modules 

import sys, string, os   

dir = 'H:\\NDVI\\ndvi'  


 # Import arcpy module 

import arcpy 

files = os.listdir(dir) 

for f in files: 

    if os.path.splitext(f)[1] == '.tif': 

     # Script arguments... 

     Input_raster_file = dir + os.sep + f 

     # Local variables...  

    Output_Workspace = "H:\\NDVI\\ndvi\\ASCII" 

     # =============== file name process ====================== 

     basename = os.path.splitext(f)[0]; 

    Output_raster = Output_Workspace + os.sep + basename + ".txt"; 

    if os.path.exists(Output_raster) == False: 

        print Input_raster_file 

        # Process: Raster To Other Format (multiple)... 

        arcpy.RasterToASCII_conversion(Input_raster_file,Output_raster) 

        print Output_raster 

输入文件名是这样的 heihe_2001_NDVI_recon.001.tif
        heihe_2001_NDVI_recon.002.tif
        heihe_2001_NDVI_recon.003.tif
           ....

问题如下：1.if os.path.splitext(f)[1] == '.tif': 是什么意思
     2.basename = os.path.splitext(f)[0];   中的[0]是什么意思
     3.运行报错  File "<string>", line 17, in <module>
NameError: name 'Input_raster_file' is not defined  问题出在哪

求各位大神解答，在此先谢过

[此贴子已经被作者于2017-6-27 19:06编辑过]