python 排序（升序或降序）

#倒序排列
arr = [1, 3, 99, 32, 22, 34, 4, 67, 5, 78, 88, 2, 56]
l = len(arr)
for i in range(l-1):
    minindex = i
    for j in range(i+1,l,1):
        if arr[j]>arr[minindex]:
            minindex = j
    # arr[minindex],arr[i] = arr[i],arr[minindex]
    arr[i], arr[minindex] = arr[minindex],arr[i]
print(arr)   #打印：[99, 88, 78, 67, 56, 34, 32, 22, 5, 4, 3, 2, 1]


#升序排列
arr1 = [1, 3, 99, 32, 22, 34, 4, 67, 5, 78, 88, 2, 56]
l = len(arr1)
for i in range(l-1):
    minindex = i
    for j in range(i+1,l,1):
        if arr1[j]< arr1[minindex]:
            minindex = j
    # arr1[minindex],arr1[i] = arr1[i],arr1[minindex]
    arr1[i], arr1[minindex] = arr1[minindex],arr1[i]
print(arr1)  #打印：[1, 2, 3, 4, 5, 22, 32, 34, 56, 67, 78, 88, 99]


#方法二
#升序 sort()和sorted()都是python排序方法，sort()永久排序，sorted()暂时排序，原list不变，会产生一个新的序列
#升序排列
##使用sort()
arr1 = [1, 3, 99, 32, 22, 34, 4, 67, 5, 78, 88, 2, 56]
arr1.sort()
print(arr1)   #打印：[1, 2, 3, 4, 5, 22, 32, 34, 56, 67, 78, 88, 99]

##使用sorted()
arr1 = [1, 3, 99, 32, 22, 34, 4, 67, 5, 78, 88, 2, 56]
print(sorted(arr1))  #打印：[1, 2, 3, 4, 5, 22, 32, 34, 56, 67, 78, 88, 99]
print(arr1)  #打印：[1, 3, 99, 32, 22, 34, 4, 67, 5, 78, 88, 2, 56]



#降序
arr1 = [1, 3, 99, 32, 22, 34, 4, 67, 5, 78, 88, 2, 56]
arr2 = sorted(arr1)
print(arr2[::-1])  #打印：[99, 88, 78, 67, 56, 34, 32, 22, 5, 4, 3, 2, 1]