The Upgrade | The Architect

Objects are not statues; they are alive! They can change over time.

A robot might start at Level 1, but we can write a spell to upgrade it.

Changing Self

Methods can do more than just print; they can modify the object's data.

class Hero:
  def __init__(self):
      self.hp = 100

  def take_damage(self):
      self.hp = self.hp - 10 # Change self!

hero = Hero()
hero.take_damage()
print(hero.hp) # 90

Define Upgrade

Inside Robot, define def upgrade(self):.

Modify Data

Inside the method, increase the level: self.level = self.level + 1 (or self.level += 1).

Multiple Upgrades

Call bot.upgrade() two times. Watch the level go from 1 to 2 to 3!

This is called "State". The object remembers its current status (Level 3), and methods change that status.

Suggested Solution

Expand

Solution:

class Robot:
  def __init__(self, name):
      self.name = name
      self.level = 1

  def upgrade(self):
      self.level = self.level + 1
      print(self.name + " upgraded to level " + str(self.level))

bot = Robot("HoppyBot")
print("Start Level: " + str(bot.level))

bot.upgrade()
bot.upgrade()

print("Final Level: " + str(bot.level))

Advanced Tips

Want more? Click to expand

F. Encapsulation

We keep the logic for upgrading inside the Robot.
This is safer than manually typing bot.level = bot.level + 1 everywhere in your code. The Robot manages its own upgrades!