This was for a Scripting for GIS class project using Arcmap 10.1 and Model Builder

ClipLooper.py

'''===============================
ClipLooper.py

The purpose of this script is to step through all 10 counties in the dataset and 
clip each of the 3 features (Water Bodies, Streams, City Limits) to the counties border. 

Script Arguments:
0 - Input County FC
1 - Input Water Bodies FC
2 - Input Streams FC
3 - Input Cities FC
4 - Workspace

Rob Abbey
12/1/2013
GISC 2250, Mini Project C
ArcGIS ver. 10.1, Python ver. 2.7
=================================='''

import arcpy, os
from arcpy import env

# Get input parameters
countyFC = arcpy.GetParameterAsText(0)
waterFeatures = arcpy.GetParameterAsText(1)
streamFeatures = arcpy.GetParameterAsText(2)
cityFeatures = arcpy.GetParameterAsText(3)

# Sets workspace
env.workspace = arcpy.GetParameterAsText(4)

# Allows the output features to be overwritten
env.overwriteOutput = True

# Sets spatial reference (WGS_1984_UTM_Zone_14N)
sr = arcpy.SpatialReference(32614)

# Allows fields to be extracted from Counties Feature Class
rows = arcpy.SearchCursor(countyFC, "", "", "NAME; Shape", "")

# Iterates through each feature in Counties Feature Class 
for row in rows:
    # Sets the clip feature
    feat = row.Shape
    
    # Creates new feature dataset based on current county name
    outputFDS = arcpy.CreateFeatureDataset_management(env.workspace,row.name,sr)
    
    # Defines output feature class, prints message to console, runs clip tool
    outputWater = str(outputFDS) + os.sep + row.name + "_" + str(waterFeatures)
    arcpy.AddWarning ("Now creating feature class: %s" % outputWater)
    arcpy.Clip_analysis(waterFeatures, feat, outputWater)
    
    outputStreams = str(outputFDS) + os.sep + row.name + "_" + str(streamFeatures)
    arcpy.AddWarning ("Now creating feature class: %s" % outputStreams)
    arcpy.Clip_analysis(streamFeatures, feat, outputStreams)
    
    outputCities = str(outputFDS) + os.sep + row.name + "_" + str(cityFeatures)
    arcpy.AddWarning ("Now creating feature class: %s\n" % outputCities)
    arcpy.Clip_analysis(cityFeatures, feat, outputCities)