Calculating a z value in python

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I have some contours where the z value is stored in the geometry and I want to display it as an attribute. I want to include this in a python script.

I have an expression which does this in python field calculator:

!Shape!.firstpoint.zThis works perfectly, but when I include it in my script:

arcpy.CalculateField_management( shapefile , "VALUE" , "!Shape!.firstpoint.z", "PYTHON")this does not work, which surprises me because I thought that the Calulate Field was exactly the same as field calcultor, but accessed through arcpy.

The error is that its a string, so has no z attribute: " File "", line 1, in AttributeError: 'str' object has no attribute 'z"

So I've tried:

arcpy.CalculateField_management( shapefile , "VALUE" , "!Shape.firstpoint.z!", "PYTHON")and that tells me that "firstpoint.z" isnt an attribute of shape

I then tried:

arcpy.CalculateField_management( shapefile , "VALUE" , "!Shape.firstpoint!.z", "PYTHON")And that seemed to view the first point as a unicode rather than a point. "File "", line 1, in AttributeError: 'unicode' object has no attribute 'z'"

It seems that my problem is getting it to view firstpoint as a point, but I'm not not why this is.



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