def analyze_mmr(fn):
 #初始化方法一
 new_loss = []
 old_loss = []
 #初始化方法二
 new_loss = old_loss =[]
 with open(fn, encoding='utf8') as f:
  for line in f:
   parts = line.split('=')
   if parts[0] == 'new_loss':
    print(parts[0])
    print('add_new_loss')
    new_loss.append(parts[1].strip())
   elif parts[0] == 'old_loss':
    old_loss.append(parts[1].strip())
   else:
    pass
 return new_loss, old_loss

n, o = analyze('../example.txt')

example.txt

new_loss=1

old_loss=3

new_loss=2

old_loss=4