[Beginner] Code Challenge: Classes

1. Setting Up Our Robot

1. Create a new class called DriveBot
2. Set up a basic constructor (no parameters needed)
3. Initialize three instance variables within our constructor which all default to 0: motor_speed, direction, and sensor_range

class DriveBot:
  def __init__(self, motor_speed=0, sensor_range=0, direction=0):
    self.motor_speed = motor_speed
    self.direction = direction
    self.sensor_range = sensor_range
  
robot_1 = DriveBot(motor_speed=5, direction=90, sensor_range=10)

print(robot_1.motor_speed)
print(robot_1.direction)
print(robot_1.sensor_range)

 

or you can manually set the values like this:

class DriveBot:
    def __init__(self):
        self.motor_speed = 0
        self.direction = 0
        self.sensor_range = 0
        
test_bot = DriveBot()
test_bot.motor_speed = 30
test_bot.direction = 90
test_bot.sensor_range = 25

 

 

2. Adding Robot Logic

추가적으로 수정이 가능하도록 method 짜기

class DriveBot:
    def __init__(self):
        self.motor_speed = 0
        self.direction = 0
        self.sensor_range = 0
    
    def control_bot(self, new_speed, new_direction):
        self.motor_speed = new_speed
        self.direction = new_direction

    def adjust_sensor(self, new_sensor_range):
        self.sensor_range = new_sensor_range

 

 

3. Enhanced Constructor

parameter를 받아들이면서도 parameter가 주어지지 않으면 default값이 나오는 method 짜기

: 이 method가 1번에 처음 만들었던 method

 

 

4. Controlling Them All

• create new class variables to disable all robots and change the latitude and the longitude of all robots

class DriveBot:
    all_disabled = False
    latitude = -999999
    longitude = -999999

#필요없는 부분 생략됨

DriveBot.all_disabled = True
DriveBot.longitude = 50.0
DriveBot.latitude = -50.0

 

 

5. Identifying Robots

1. Create a new class variable in the DriveBot class called robot_count
2. In the constructor, increment the robot_count by 1
3. After incrementing the value, assign the value of robot_count to a new instance variable called id.

class DriveBot:
    all_disabled = False
    latitude = -999999
    longitude = -999999
    robot_count = 0
    
    def __init__(self, motor_speed = 0, direction = 180, sensor_range = 10):
        self.motor_speed = motor_speed
        self.direction = direction
        self.sensor_range = sensor_range
        robot_count += 1
        id = robot_count

 

오류

File "script.py", line 23, in <module>
    robot_1 = DriveBot()
  File "script.py", line 12, in __init__
    robot_count += 1
UnboundLocalError: local variable 'robot_count' referenced before assignment

 

수정

class DriveBot:
    all_disabled = False
    latitude = -999999
    longitude = -999999
    robot_count = 0

    def __init__(self, motor_speed = 0, direction = 180, sensor_range = 10):
        self.motor_speed = motor_speed
        self.direction = direction
        self.sensor_range = sensor_range
        DriveBot.robot_count += 1
        self.id = DriveBot.robot_count