old_contents: class Turma(object):
  	def __init__(self,turma):
  		self.id = turma.getId()
  		self.letra = turma.getLetra()
  
new_contents: class Turma(object):
  	def __init__(self,turma):
  		self.id = turma.getId()
  		self.letra = turma.getLetra()
  		self.id_disciplina = turma.getId_disciplina()
  
subject: Update Turma.py