The following Python code returns this error, and I have no idea how to fix it. Any and all help would be appreciated

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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The following Python code returns this error, and I have no idea how to fix it.  Any and all help would be appreciated

Traceback (most recent call last):
  File "D:\Grand Canyon University\CST_580\Topic 4\project 6a.py", line 40, in <module>
    agent.move()
  File "D:\Grand Canyon University\CST_580\Topic 4\project 6a.py", line 13, in move
    new_location = self.current_location + direction
                   ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
TypeError: unsupported operand type(s) for +: 'int' and 'str'

 

<start of Python code>

import random

class Agent:
    def __init__(self, start_location, destination_location):
        self.current_location = start_location
        self.destination_location = destination_location

    def move(self):
        # Randomly choose a direction to move in
        direction = random.choice(['up', 'down', 'left', 'right'])

        # Move in the chosen direction
        new_location = self.current_location + direction

        # Calculate the distance to the destination
        distance_to_destination = abs(new_location - self.destination_location)

        # Reward the agent if it moves closer to the destination
        if distance_to_destination < self.current_distance_to_destination:
            self.reward += 1

        # Penalize the agent if it moves away from the destination
        elif distance_to_destination > self.current_distance_to_destination:
            self.reward -= 1

        # Update the agent's current location
        self.current_location = new_location

    def is_at_destination(self):
        return self.current_location == self.destination_location

# Create an agent at a random start location
agent = Agent(random.randint(0, 10), random.randint(0, 10))

# Set the initial reward to 0
agent.reward = 0

# While the agent is not at the destination, keep moving
while not agent.is_at_destination():
    agent.move()

<end of Python code>

 

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