为什么我输出的是空列表

如题所示
问题：

我的代码：

animals=[]
while True:
    inputthing = input().split()
    if inputthing :
        break
    else:
        animals.append(inputthing)
for i in range(len(animals)):
    name = animals[i][0]
    if 't' in animals[i][1]:
        amount = float(animals[i][1][:-1])*1000
       
        weight = animals[i][1]
    else:
        amount = float(animals[i][1][:-2])
        
        weight = animals[i][1]
        animals[i] = [name,weight,amount]
animals = sorted(animals,key = lambda animal:animal[2])
for i in range(len(animals)):
    animals[i] = [animals[i].name,animals[i].weight]
print(animals)

运行结果：
【当然输入不止图中所示】

没有输入的时候判断方法不正确，可以参考

animals = []
while True:
    inputthing = input().split()
    if len(inputthing) == 0:  # 没有输入的时候
        break
    else:
        animals.append(inputthing)
        
def getWeight(animal):
    w = animal[1]
    if 't' in w:
        return float(w[:-1])*1000
    return float(w[:-2])

animals = sorted(animals, key=getWeight)

print(animals)