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Why do I get a string argument error when calling a package class located in another folder?

Posted on 2011-03-03
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Last Modified: 2012-06-27
I have written a Python 2.5.6 (ESRI install) calling routine that is located at ..fc_main\Calls (see attachment 1).  My called package (attachment 2) is located at ..fc_main\Classes.  When I run the calling routine in IDLE version 2.6.5, I get the following error message on the last line:

Traceback (most recent call last):
  File "C:\Projects\Front Counter\fc_main\Calls\TileCall.py", line 8, in <module>
    VisibleCheck.CheckOnOffLayers("Front Counter Data", "Parcels", "False")
TypeError: unbound method CheckOnOffLayers() must be called with VisibleCheck instance as first argument (got str instance instead).

Can you explain why the method is unbound, and why I'm getting this message?

Thanks in advance. TileCall.py MCPIClasses.py
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Question by:cshore12
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2 Comments
 
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Accepted Solution

by:
ute_arbeit earned 300 total points
ID: 35028429
There are two things to change if you wanted CheckOnOffLayers to be a 'normal' method defined in a class:

1. The first argument for a class method is always the reference to the class instance, as a convention named 'self'. So your CheckOnOffLayers method must be defined like this:
def CheckOnOffLayers(self, strDF, strLayerName, blnLayer):

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2. And you have to create an instance of your VisibleCheck class and call the method on this instance:
visibleCheck = VisibleCheck()
visibleCheck.CheckOnOffLayers("Front Counter Data", "Parcels", "False")

Open in new window


Or if you wanted CheckOnOffLayers to be a static class method you have to add the decorator @staticmethod to it:
@staticmethod
def CheckOnOffLayers(strDF, strLayerName, blnLayer):

Open in new window


and call it on the class itself:
VisibleCheck.CheckOnOffLayers("Front Counter Data", "Parcels", "False")

Open in new window

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Author Closing Comment

by:cshore12
ID: 35037183
Both approaches worked like a charm.

I'm also finding that the importing the arcpy module can be very touchy.  I added the appropriate paths to the path and PYTHONPATH system variables, and today the import (obviously) is working OK.  Let's hope it will stick.
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