python测试常见⾯试题
1、统计元素的个数：a = [1, 2, 3, 1, 1, 2]dict = {}
for key in a:
dict[key] = dict.get(key,0) + 1print(dict)
def count(m): for i in a:
result = a.count(m) print(result)
if __name__ == \"__main__\": count(1)
2、冒泡排序
def bubble_sort(num):
for i in range(len(num)-1): #这个循环负责设置冒泡排序进⾏的次数,即循环的趟数 for j in range(len(num)-1-i): #i的初始值为0，每次循环确定⼀个值，循环⼀次，减少⼀趟 if num[j] > num[j+1]:
num[j],num[j+1] = num[j+1],num[j] return num
if __name__ == \"__main__\": num = [1,2,3,4,9,5,2,3,8] print(bubble_sort(num))3、处理⼀维数li = []
arr = [[\"zhang\"],[\"wamg\"],[\"li\"],[\"zhao\"]]for i in arr: for j in i: li.append(j)print(li)
4.两个列表转成字典list1 = [1,2,3]
list2 = [\"a\dict = dict(zip(list1,list2))print(dict)5.洗牌游戏import random
def shuffle(lis): result = [] while lis:
p = random.randrange(len(lis)) result.append(lis[p]) lis.pop(p) return result
r = shuffle([1,2,3,4,6,7,8,9,10])print(r)
