old_contents: class Skill:
  	def __init__(self, save, defence, midfield, attack, speed):
  		self.save = save
  		self.defence = defence
  		self.midfield = midfield
  		self.attack = attack
  		self.speed = speed
  		
  	
  
new_contents: class Skill:
  	def __init__(self, save, defence, midfield, attack, speed, fitness):
  		self.save = save
  		self.defence = defence
  		self.midfield = midfield
  		self.attack = attack
  		self.speed = speed
  		self.fitness = fitness
  		
  	
  
subject: Update skill.py