小白的自我救赎：今日份python练习

小白的自我救赎：今日份python练习

练习1：输出任意长度由字母和数字组成的验证码

import random
def code_generate(code_len):all_char = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'last_char_pos = len(all_char) -1code = ''for _ in range(code_len):index = random.randint(0,last_char_pos)code += all_char[index]return codeprint(code_generate(4))

练习2：双色球选号

from random import randint,sample
def select_balls():red_balls = [x for x in range(1,36)]select_ball = sample(red_balls,6)select_ball.sort()select_ball.append(randint(1,16))return select_balldef display_ball(ball):l = len(ball)for i in range(l):if i == l-1:print('|',ball[i])else:print(ball[i],end=' ')print()def main():n = int(input('请输入机选组数：'))for _ in range(n):display_ball(select_balls())if __name__ == '__main__':main()

练习3：约瑟夫环问题

'''有15个基督徒和15个非基督徒在海上遇险，
为了能让一部分人活下来不得不将其中15个人扔到海里面去，
有个人想了个办法就是大家围成一个圈，由某个人开始从1报数，
报到9的人就扔到海里面，他后面的人接着从1开始报数，报到9
的人继续扔到海里面，直到扔掉15个人。由于上帝的保佑，
15个基督徒都幸免于难，问这些人最开始是怎么站的，哪些位置
是基督徒哪些位置是非基督徒。'''def main():person = [True] *30pass_p,i,number = 0,0,0while pass_p < 15:if person[i]:number += 1if number == 9:pass_p += 1number = 0person[i] =Falsei += 1i %= 30for p in person:print('基督徒' if p == True else '非基督徒',end=' ')if __name__ =='__main__':main()

练习4：选择排序

def fast_order(list1):l = len(list1)for i in range(l-1):min_pos = itemp = 0for j in range(i+1,l):if list1[min_pos] > list1[j]:min_pos = jif min_pos != i:temp = list1[i]list1[i] = list1[min_pos]list1[min_pos] = tempreturn list1def main():list1 = [1,3,6,7,2,5,9,0,8]print(fast_order(list1))if __name__ == '__main__':main()

练习5：冒泡排序

def bubble_order(list1):l = len(list1)for i in range(l):temp = 0for j in range(l-1-i):if list1[j] > list1[j+1]:temp = list1[j]list1[j] = list1[j+1]list1[j+1] = tempreturn list1def main():list1 = [4,7,9,1,3,0,5,8,2]print(bubble_order(list1))if __name__ == '__main__':main()

外圈循环次数是元素的个数，内圈是元素个数-i-1，因为每一次循环都会冒出一个最大值，因此是-i

练习6：快速排序

def quick_sort(list1):l = len(list1)if l < 2:return list1else:left,right = [],[]mid = list1[l // ve(mid)for i in list1:if i > mid:right.append(i)else:left.append(i)return quick_sort(left) + [mid] + quick_sort(right)

练习7：插入排序

def insert_sort(list1):l = len(list1)for i in range(1,l):key = list1[i]j = i - 1while j >= 0:if list1[j] > key:list1[j],list1[j+1] = key,list1[j+1]j-=1return list1