How to change orientation for navigation

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How can I change the value goal.target_pose.pose.orientation.w = 1.0 to not be constant. I would like to assign it like this: self.xQR1 = -1.07449212074 self.yQR1 = 0.59228172302

self.wQR1 = ......

original code

import rospy
import actionlib
from move_base_msgs.msg import MoveBaseAction, MoveBaseGoal
from math import radians, degrees
from actionlib_msgs.msg import *
from geometry_msgs.msg import Point


class map_navigation():

  def choose(self):

    choice='q'

    rospy.loginfo("|-------------------------------|")
    rospy.loginfo("|PRESSE THE KEY:")
    rospy.loginfo("|'0': Start ")
    rospy.loginfo("|'q': Quit ")
    rospy.loginfo("|-------------------------------|")
    rospy.loginfo("|WHERE TO GO?")
    choice = input()
    return choice

  def __init__(self):



    # declare the coordinates of interest
    self.xQR1 =  -1.07449212074
    self.yQR1 = 0.59228172302
    self.xQR2 = -1.8156080246
    self.yQR2 = 10.0032901764
    self.xQR3 = 30.44
    self.yQR3 = 12.50
    self.xQR4 = 35.20
    self.yQR4 = 13.50
    self.goalReached = False
    # initiliaze
    rospy.init_node('map_navigation', anonymous=False)
    choice = self.choose()

    if (choice == 0):

      self.goalReached = self.moveToGoal(self.xQR1, self.yQR1)

      QR1 = True

    elif (QR1 == True):

      self.goalReached = self.moveToGoal(self.xQR2, self.yQR2)

      QR2 = True; 

    elif (QR2 == True):

      self.goalReached = self.moveToGoal(self.xOffice2, self.yOffice2)

    elif (choice == 3):

      self.goalReached = self.moveToGoal(self.xOffice3, self.yOffice3)

    if (choice!='q'):

      if (self.goalReached):
        rospy.loginfo("Congratulations!")
        #rospy.spin()


    while choice != 'q':
      choice = self.choose()
      if (choice == 0):

        self.goalReached = self.moveToGoal(self.xQR1, self.yQR1)

      elif (choice == 1):

        self.goalReached = self.moveToGoal(self.xOffice1, self.yOffice1)

      elif (choice == 2):

        self.goalReached = self.moveToGoal(self.xOffice2, self.yOffice2)

      elif (choice == 3):

        self.goalReached = self.moveToGoal(self.xOffice3, self.yOffice3)

      if (choice!='q'):

        if (self.goalReached):
          rospy.loginfo("Congratulations!")
          #rospy.spin()


  def shutdown(self):
        # stop turtlebot
        rospy.loginfo("Quit program")
        rospy.sleep()

  def moveToGoal(self,xGoal,yGoal):

      #define a client for to send goal requests to the move_base server through a SimpleActionClient
      ac = actionlib.SimpleActionClient("move_base", MoveBaseAction)

      #wait for the action server to come up
      while(not ac.wait_for_server(rospy.Duration.from_sec(5.0))):
              rospy.loginfo("Waiting for the move_base action server to come up")


      goal = MoveBaseGoal()

      #set up the frame parameters
      goal.target_pose.header.frame_id = "map"
      goal.target_pose.header.stamp = rospy.Time.now()

      # moving towards the goal*/

      goal.target_pose.pose.position =  Point(xGoal,yGoal,0)
      goal.target_pose.pose.orientation.x = 0.0
      goal.target_pose.pose.orientation.y = 0.0
      goal.target_pose.pose.orientation.z = 0.0
      goal.target_pose.pose.orientation.w = 1.0

      rospy.loginfo("Sending goal location ...")
      ac.send_goal(goal)

      ac.wait_for_result(rospy.Duration(60))

      if(ac.get_state() ==  GoalStatus.SUCCEEDED):
              rospy.loginfo("You have reached the destination")
              return True

      else:
              rospy.loginfo("The robot failed to reach the destination")
              return False

if __name__ == '__main__':
    try:

        rospy.loginfo("You have reached the destination")
        map_navigation()
        rospy.spin()

    except rospy.ROSInterruptException:
        rospy.loginfo("map_navigation node terminated.")