Writing Python Code to create a Median tool in ArcGIS 10.2

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I am attempting to write the code for a toll in Python that will effectively:

• access the city data and load it, if it isn't already in the list of layers
• get a country name from the user and access just the cities inside that country
• calculate the median POP_RANK of all cities in that country and report the median to the user

I am fairly new to Python, as this is all have so far. Any help would be appreciated. Cheers!

import arcpy as ARCPYdef medianCalculation(): mxd = ARCPY.mapping.MapDocument("CURRENT") df = ARCPY.mapping.ListDataFrames (mxd) [0] country = ARCPY.GetParameter(0) countryCursor = ARCPY.da.SearchCursor("cities", ["CNTRY_NAME", "POP_RANK"]) POPDict = {} for country in countryCursor:

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