输入三个整数x,y,z，请把这三个数由小到大输出
冒泡法：
list1 = []
for i in range(4):
x = input("请输入整数")
x = int(x)
list1.append(x)
for a in range(1,4):
for b in range(0,4-a):
if list1[b] > list1[b+1]:
list1[b],list1[b+1] = list1[b+1],list1[b]
print(list1)
函数法：sort()
list1 = []
for i in range(4):
x = input("请输入整数")
x = int(x)
list1.append(x)
list1.sort()
print(list1)
原文：https://www.cnblogs.com/howiehuang/p/11134129.html