写一个python 选择排序：
def selection_sort(list):
for fill_slot in range(0, len(list) - 1, 1):
print(fill_slot)
index = fill_slot
for location in range(fill_slot + 1, len(list), 1):
if list[location] > list[index]:
index = location
list[fill_slot], list[index] = list[index], list[fill_slot]
if __name__ == '__main__':
a_list = [54, 26, 93, 17, 77, 31, 44, 55, 20]
selection_sort(a_list)
print(a_list)
range(start, end, step) 产生一个可以迭代的对象。
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