What are the Python list sorting methods?

Python list sorting: 1. Bubble sorting is a simple sorting algorithm. It repeatedly traverses the sequence to be sorted, compares two elements at a time, and swaps them if they are in the wrong order; 2. Insertion sort, by constructing an ordered sequence, for unsorted data, scan from back to front in the sorted sequence, find the corresponding position and insert it.

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1. Bubble sorting

Bubble Sort is a simple sorting algorithm. It repeatedly iterates through the array to be sorted, comparing two elements at a time and swapping them if they are in the wrong order. The work of traversing the array is repeated until no more exchanges are needed, which means that the array has been sorted. The name of this algorithm comes from the fact that smaller elements will slowly "float" to the top of the array through swapping.

def bubble_sort(list):
    n = len(list)
    for i in range(n - 1):
        for j in range( 0,n - 1 - i):
            if list[j] > list[j + 1]:
                list[j], list[j + 1] = list[j + 1], list[j]
        # if list[i] > list[i + 1]:
        #     list[i], list[i + 1] = list[i + 1], list[i]
    print(list)
list=[2,4,6,8,1,3,5,7,9]
bubble_sort(list)
#结果：[1,2,3,4,5,6,7,8,9]

2. Insertion Sort

Insertion Sort is a simple and intuitive sorting algorithm. It works by constructing an ordered sequence. For unsorted data, it scans from back to front in the sorted sequence, finds the corresponding position and inserts it. In the implementation of insertion sort, during the scanning process from back to front, the sorted elements need to be gradually moved backward to provide insertion space for the latest elements.

def insertion_sort(list):
  n = len(list)
  for i in range(1, n):
    for j in range(i, 0, -1):
      if list[j] < list[j - 1]:
        list[j], list[j - 1] = list[j - 1], list[j]
      else:
        break
  print(list)
insertion_sort([3,0,2,5,8,5,9,41,0,1,6])
#结果：[0, 0, 1, 2, 3, 5, 5, 6, 8, 9, 41]

3. Selection Sort

Selection Sort is a simple and intuitive sorting algorithm. Its working principle is as follows: first find the smallest (large) element in the unsorted sequence, store it at the starting position of the sorted sequence, and then continue to find the smallest (large) element from the remaining unsorted elements. placed at the end of the sorted sequence. And so on until all elements are sorted.

def selection_sort(list):
    n = len(list)
    for i in range(0, n -1):
        min_index = i
        for j in range(i + 1, n):
            if list[min_index] > list[j]:
                min_index = j
        if i != min_index:
            list[min_index], list[i] = list[i], list[min_index]
    print(list)
selection_sort([5,9,6,42,9,4,66,2,3,0,1])
#结果：0, 1, 2, 3, 4, 5, 6, 9, 9, 42, 66]

Summary:

import random
# 随机生成1-1000之间无序序列整数数据
def generator():
    random_data = []
    for i in range( 0, 10 ):
        random_data.append( random.randint( 1, 1000 ) )
    return random_data
# 冒泡排序
def bubble_sort(list):
    # 序列长度
    n = len( list )
    for i in range( 0, n ):
        for j in range( i , n ):
            if list[i] > list[j]:
                list[i], list[j] = list[j], list[i]
    return list
 # 选择排序
def selection_sort(list):
    n = len(list)
    for i in range(0, n -1):
        min_index = i
        for j in range(i + 1, n):
            if list[min_index] > list[j]:
                min_index = j
        if i != min_index:
            list[min_index], list[i] = list[i], list[min_index]
    return list
#插入排序
def insertion_sort(list):
  n = len(list)
  for i in range(1, n):
    for j in range(i, 0, -1):
      if list[j] < list[j - 1]:
        list[j], list[j - 1] = list[j - 1], list[j]
      else:
        break
  return list
if __name__ == "__main__":
    # 生成随机无序数据
    list = generator()
    # 打印无序数据
    print( &#39;随机生成的无序数据：&#39;,list )
    # 冒泡排序
    sorted_data = bubble_sort( list )
    #插入排序
    insertion_data=insertion_sort(list)
    #选择排序
    selection_data=selection_sort( list )
    # 打印排序结果
    print( &#39;冒泡排序：&#39;,sorted_data )
    print( &#39;插入排序：&#39;, insertion_data )
    print( &#39;选择排序：&#39;, selection_data )
&#39;&#39;&#39;
结果：
随机生成的无序数据： [300, 517, 591, 209, 204, 789, 417, 739, 803, 393]
冒泡排序： [204, 209, 300, 393, 417, 517, 591, 739, 789, 803]
插入排序： [204, 209, 300, 393, 417, 517, 591, 739, 789, 803]
选择排序： [204, 209, 300, 393, 417, 517, 591, 739, 789, 803]
&#39;&#39;&#39;

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