How to use na.Solve() on layers already created? [on hold]

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I am fairly new to arcpy and I am having troubles recreating the following set of instructions with a python script.

1. Open the KeyChainTest.mxd
2. Enable the Network Analyst extension.
3. Click solve on the Network Analyst toolbar. The green route line should go through the large point, which represents a locked door. If it avoids the door by going the long way around the block, the test has failed.
4. Double-click the Route layer in the TOC to open the Layer Properties.Click the Attribute Paramters tab.For the KeyIDs parameter, remove to essentially indicate you don't have the key for the door anymore.
5. Click OK to close the Layer Properties dialog box.Solve again.
6. The route should should take the long way around to avoid the door. If it goes through the door, the test has failed.

I have all the data setup, I just don't understand how I would go about solving with arcpy and then check whether the solve worked correctly.



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