try:
    dati=open(variabili.txt)
except:
    dati=open(variabili.txt ,'w')
    self.variabile.write('0')
    self.variabile.close()
    self.variabile=open(self.nome_file)
self.val=int(self.variabile.read())
self.variabile.close()

def read(self):
    self.variabile=open(self.nome_file)
    self.val=self.variabile.read()
    self.variabile.close()
    self.val=int(self.val)
    return self.val

def write(self):
    self.variabile=open(self.nome_file,'w')
    self.variabile.write(f'{self.val}')
    self.variabile.close()