Python排序与查找算法收集

Python 语言实现几种不同的排序算法，代码来自于老男孩Python全栈开发，学习教程！

import random
import time
import copy
import sys

def cal_time(func):
    def wrapper(*args, **kwargs):
        t1 = time.time()
        result = func(*args, **kwargs)
        t2 = time.time()
        print("%s running time: %s secs." % (func.__name__, t2 - t1))
        return result
    return wrapper

@cal_time
def bubble_sort(li):
    for i in range(len(li) - 1):
        for j in range(len(li) - i - 1):
            if li[j] > li[j+1]:
                li[j], li[j+1] = li[j+1], li[j]

@cal_time
def bubble_sort_1(li):
    for i in range(len(li) - 1):
        exchange = False
        for j in range(len(li) - i - 1):
            if li[j] > li[j+1]:
                li[j], li[j+1] = li[j+1], li[j]
                exchange = True
        if not exchange:
            break

def select_sort(li):
    for i in range(len(li) - 1):
        min_loc = i
        for j in range(i+1,len(li)):
            if li[j] < li[min_loc]:
                min_loc = j
        li[i], li[min_loc] = li[min_loc], li[i]


def insert_sort(li):
    for i in range(1, len(li)):
        tmp = li[i]
        j = i - 1
        while j >= 0 and li[j] > tmp:
            li[j+1]=li[j]
            j = j - 1
        li[j + 1] = tmp


def quick_sort_x(data, left, right):
    if left < right:
        mid = partition(data, left, right)
        quick_sort_x(data, left, mid - 1)
        quick_sort_x(data, mid + 1, right)

def partition(data, left, right):
    tmp = data[left]
    while left < right:
        while left < right and data[right] >= tmp:
            right -= 1
        data[left] = data[right]
        while left < right and data[left] <= tmp:
            left += 1
        data[right] = data[left]
    data[left] = tmp
    return left


@cal_time
def quick_sort(data):
    return quick_sort_x(data, 0, len(data) - 1)

@cal_time
def sys_sort(data):
    return data.sort()

def sift(data, low, high):
    i = low
    j = 2 * i + 1
    tmp = data[i]
    while j <= high: #只要没到子树的最后
        if j < high and data[j] < data[j + 1]:
            j += 1
        if tmp < data[j]:#如果领导不能干
            data[i] = data[j] #小领导上位
            i = j
            j = 2 * i + 1
        else:
            break
    data[i] = tmp

def heap_sort(data):
    n = len(data)
    for i in range(n // 2 - 1, -1, -1):
        sift(data, i, n - 1)
        for i in range(n - 1, -1, -1):
            data[0], data[i] = data[i], data[0]
            sift(data, 0, i - 1)

sys.setrecursionlimit(100000)
data = list(range(1000, 1, -1))
data.sort()
#random.shuffle(data)
data1 = copy.deepcopy(data)
data2 = copy.deepcopy(data)
data3 = copy.deepcopy(data)

bubble_sort(data1)
quick_sort(data2)
sys_sort(data3)

Python语言实现的几种，不同的查找算法。

import time
import random

def cal_time(func):
    def wrapper(*args, **kwargs):
        t1 = time.time()
        result = func(*args, **kwargs)
        t2 = time.time()
        print("%s running time: %s secs." % (func.__name__, t2 - t1))
        return result
    return wrapper

@cal_time
def bin_search(data_set, val):
    low = 0
    high = len(data_set) - 1
    while low <= high:
        mid = (low+high)//2
        if data_set[mid]['id'] == val:
            return mid
        elif data_set[mid]['id'] < val:
            low = mid + 1
        else:
            high = mid - 1
    return


def binary_search(dataset, find_num):
    if len(dataset) > 1:
        mid = int(len(dataset) / 2)
        if dataset[mid] == find_num:
            #print("Find it")
            return dataset[mid]
        elif dataset[mid] > find_num:
            return binary_search(dataset[0:mid], find_num)
        else:
            return binary_search(dataset[mid + 1:], find_num)
    else:
        if dataset[0] == find_num:
            #print("Find it")
            return dataset[0]
        else:
            pass
            #print("Cannot find it.")

@cal_time
def binary_search_alex(data_set, val):
    return binary_search(data_set, val)

def random_list(n):
    result = []
    ids = list(range(1001,1001+n))
    a1 = ['zhao','qian','sun','li']
    a2 = ['li','hao','','']
    a3 = ['qiang','guo']
    for i in range(n):
        age = random.randint(18,60)
        id = ids[i]
        name = random.choice(a1)+random.choice(a2)+random.choice(a3)

data = list(range(100000000))
print(bin_search(data, 173320))
print(binary_search_alex(data, 173320))