title: How to continually save x,y coordinates in Survey Traverse?
body: <p>I'm trying to write a simple land surveying program in Python. For each traverse leg, I want the azimuth and the changes in both the north-south and east-west positions to be stored in a dictionary called <code>corDict</code> for later retrieval and analysis (point numbers would be great, too). </p>
  
  <p>I've gotten this far but am stumped on how to iterate the process and continually add to the data storage dictionary.</p>
  
  <pre><code>import ui
  import math
  
  class Survey:
  def __init__(self, brng, dist,lat,dep):  #bearing to be entered like this:
      self.brng = brng.                    # 'S45.2341E'
      self.dist = dist
      self.lat = lat
      self.dep = dep
  
  
  def course(self):
      b = self.brng
      quad = b[0] + b[-1]
      decpoint = b.find('.')                #find the decimal point     
      deg = int(b[1:decpoint])              #convert dms to decimal degrees
      mins = int(b[decpoint+1:-3])/60.
      sec = int(b[-3:-1])/3600.
      az = (deg+mins+sec)
      if quad == 'NE':
          az = az
      elif quad == 'SE':
          az = 180 - az
      elif quad == 'SW':
          az = 180 + az
      elif quad == 'NW':
          az = 360 - az                            #need to convert to radians
      lat = math.cos(az*math.pi/180)*self.dist     #lat - change in north-south 
      dep = math.sin(az*math.pi/180)*self.dist     #dep - change in east-west 
      return az, lat, dep
  
  
  def store_az_lat_dep():
      #brng = input('Input bearing:  ')
      #dist = input('Input distance:  ')           #--&gt; eventually for user input
      #xy = Survey(brng, dist, 10000, 10000)        #ignore the 10000,10000
      xy = Survey('45.0000E', 100, 10000, 10000)    #--&gt;for example
      corDict = {xy.course()[0] : xy.course()[1:]}  
      print corDict
  
  store_az_lat_dep()
  </code></pre>