[Python] Quitting to Game Over when player dies

So, I'm working on a python text-based game that I can share with my friends. I've got most of the game working, but I'm struggling with the game over portion for when a user selects certain commands. I'm not using pygame for this because I can't find a 64-bit version. Below is what I'm looking at. What do I put in the gameOver function to actually quit the game, or if the player wants, try again?

import time
import random
import sys

def searchAreas():
print("1. Area1")
print("2. Area2")
print("3. Area3")
print("4. Just give up")

def badResponse():
print("Sorry, I don't understand " + search_area)

def gameOver():
print("You decide to give up because life is too hard.")
print("Would you like to try again?")
player_choice = input("> ")
if player_choice == "Yes":
mainGame()
elif player_choice == "No":
print("# what goes here to quit the game?")
else:
badResponse()

def mainGame():
search_area_options = ["1","2","3"]
search_area = ""
while search_area not in search_area_options:
print("Where do you want to start looking?")
searchAreas()
search_area = str(input("> "))
if search_area == "1":
print("Text here")
elif search_area == "2":
print("Text here")
elif search_area == "3":
print("text here")
elif search_area == "4":
gameOver()
else:
badResponse()

mainGame()



When typing anything but the four options, or when going into the gameOver function, I'm seeing this error:

Traceback (most recent call last):
File "./test.py", line 45, in <module>
mainGame()
File "./test.py", line 43, in mainGame
badResponse()
File "./test.py", line 14, in badResponse
print("Sorry, I don't understand " + search_area)
NameError: name 'search_area' is not defined

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