class.py

class Spaceship:
   # Class attribute
   tractor_beam = 'off'

   # Instance attributes
   def __init__(self, name, kind):
       self.name = name
       self.kind = kind
       self.speed = None

  # Instance methods
   def warp(self, warp):
       self.speed = warp
       print(f'Warp {warp}, engage!')

   def tractor(self):
       if self.tractor_beam == 'off':
           self.tractor_beam = 'on'
           print('Tractor beam on.')
       else:
           self.tractor_beam = 'off'
           print('Tractor beam off')


# Create an instance of the Spaceship class (i.e. "instantiate")
ship = Spaceship('Mockingbird','rescue frigate')

# Check ship's name
print(ship.name)

# Check what kind of ship it is
print(ship.kind)

# Check tractor beam status
print(ship.tractor_beam)

# Set warp speed
ship.warp(7)

# Check speed
print(ship.speed)

# Toggle tractor beam
ship.tractor()

# Check tractor beam status
print(ship.tractor_beam)