python动物质量排序

问题遇到的现象和发生背景 python动物重量排序
用代码块功能插入代码，请勿粘贴截图
我想要达到的结果

img

img

ls = []

while True:

    temp = input()
    if temp == '':
        break
    ls.append(temp.split())
    print(sorted(ls,key=lambda weight:float(weight[1][:-1]) * 1000 if weight[1][-1] == 't' else int(weight[1][:-2])))

animals = []
while True:
    str1 = input()
    # print(str1)
    if str1 == '':
        break
    else:
        animal, weight = str1.split()
        if 't' in weight:
            w = weight[:-1]
            unit = weight[-1]
            # 将单位转为kg，方便进行排序
            weight_kg = float(w) * 1000
            animals.append([animal, w, unit, weight, weight_kg])
        else:
            w = weight[:-2]
            unit = weight[-2:]
            weight_kg = float(w)
            animals.append([animal, w, unit, weight, weight_kg])
# print(animals)
# print(sorted(animals, key=lambda x: x[4]))
# 按重量（单位kg）排序
animals = sorted(animals, key=lambda x: x[4])
for i in range(len(animals)):
    animals[i] = [animals[i][0], animals[i][3]]
print(animals)