[Beginner question] Error when converting raster to ASCII

[Becky Kern]

Hi again users,

This is in response to my post from 11/14/2010 (see below)

>* Hi users,
*>* I'm using Python 2.5 (in concert with ArcGIS 9.3) to convert a raster to
*>* an ASCII file. I used the code (listed below) several weeks ago to
*>* successfully do the conversion, but when I tried to replicate it a few
*>* days ago, I got an error message.
*>* import arcgisscripting
*>* gp = arcgisscripting.create(9.3)
*>* InRaster = "C:/data/raster1"
*>* OutAsciiFile = "C:/data/raster2ascii.asc"
*>* gp.RasterToASCII_conversion(InRaster, OutAsciiFile)
*>* The error message:
*>* arcgisscripting.ExecuteError: Failed to execute. Parameters are not
*>* valid. raster1 does not exist.
*>* My file path has not changed so I don't understand why Python can no
*>* longer recognize my raster file. Any ideas?
*>*
*
MRAB responded:
Just to make sure, does os.path.isfile(InRaster) return True?

When I tried os.path.isfile(InRaster), I received the following error
message:
"NameError: name 'os' is not defined"

Does this shed any light on why my raster to ASCII conversion isn't working?

Thanks again.
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