Python 体重判断程序：输入体重，判断是否偏瘦、中等或肥胖

weight = input('请输入体重：')

if not weight.isdigit() or int(weight) > 80: print('非法输入') elif int(weight) <= 80: print('偏瘦') elif int(weight) <= 120: print('中等') else: print('肥胖')