Writing Python Code to create a Median tool in ArcGIS 10.2

Question

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.

import arcpy as ARCPY

def 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:

Answer 1

You would need to look into some Help pages.

• Add the layer to the TOC.
• Get parameter (country name) as text.
• Get your cities into an array with arcpy.da.SearchCursor and do simple math with Python.