add homework 8 code and updates to homework 5 for the new data

Author: crbates

__init__.py

@@ -0,0 +1,59 @@
+import sys
+import argparse
+#This adds the parent directory to the path which includes hw5
+sys.path.append("../")
+import hw5.hw5
+import sqlite3
+import matplotlib.pyplot as plt
+import matplotlib.dates as mdates
+import datetime
+
+#argument parsing setup
+parser = argparse.ArgumentParser(description='intrade election data')
+parser.add_argument('-c',dest='candidate',help='Candidates name default:Obama',default='Obama')
+parser.add_argument('-d',dest='date',help='Date in yyyy-mm-dd format default:2012-03-14',default='2012-03-14')
+parser.add_argument('-r',dest='race',help='race id 1: Republican Nomination 2:Presidential Election 3:Republican VP default:2',default=2)
+parser.add_argument('-p',action='store_true',dest='plot',help='plot results')
+parser.add_argument('-i',action='store_true',dest='init',help='initialize database')
+results = parser.parse_args()
+
+#initializes the database if requested
+if results.init:
+    hw5.hw5.initdb()
+    
+# select the iformation for the candidate of interest     
+connection = sqlite3.connect("elections.db")
+cursor = connection.cursor()
+sql_cmd = """SELECT predictions.date, predictions.price from predictions left join candidates on
+    candidates.candidate_id = predictions.candidate_id where predictions.race_id=""" + str(results.race) + """ and
+    candidates.name like \"%""" + str(results.candidate) + """%\" ORDER BY predictions.date ASC"""
+cursor.execute(sql_cmd)            
+result = cursor.fetchall()
+dprice = []
+ddates = []
+total = []
+finaldates = []
+for item in result:
+    dprice.append(item[1])
+    ddates.append(item[0])
+    #print item[0]
+    if item[0] in results.date:
+        price = item[1]
+        print "Candidate: ", results.candidate, " Date: ", item[0], " probability: ", item[1], "%"
+#sum the probabilities for all shared dates    
+if results.plot:
+    for index, date in enumerate(ddates):
+        total.append(dprice[index])
+        finaldates.append(datetime.datetime.strptime(date,"%Y-%m-%d"))
+    #plot the result
+    fig = plt.figure()
+    ax = fig.add_subplot(111)
+    ax.plot(finaldates,total)
+    yearsFmt = mdates.DateFormatter('%m-%d-%Y')
+    ax.xaxis.set_major_formatter(yearsFmt)
+    fig.autofmt_xdate()
+    plt.hold(True)
+    plt.plot(datetime.datetime.strptime(results.date,"%Y-%m-%d"),price,'ro')
+    plt.xlabel("Date")
+    plt.ylabel("Probability of winning (%)")
+    plt.show()