“世风日下”四人小组知识库

存储

1. 心跳口怎么通信？（ICE） https://blog.csdn.net/lycb_gz/article/details/8729590 万兆以太网规范 (opens new window)
2. 产品规格(64 核，飞腾 2000)
3. 接管流程？接管时间指标
4. 多看看别人的产品怎么设计
5. 怎么看待产品经理这个岗位？这个岗位都做什么
6. 技术选型： Python vs JAVA
7. 喜欢和测试打交道吗？
8. 竞品：你们产品和别家产品有没有什么不同？优势在哪？
9. 对象存储了解吗？
10. 讲一下你们的分布式存储架构；

Python 面试

编程

• 单例模式

# 装饰器
def singleton(cls):
    instances = {}
    def wrapper(*args, **kw):
        if cls not in instances:
            instances[cls] = cls(*args, **kw)
        return instances[cls]
    return wrapper

@singleton
class MyClass:
    pass


# new 方法
class Singleton:

    _instance = None

    def __new__(cls,*args,**kwargs):
        if not cls._instance:
            # cls._instance = super(Singleton,cls).__new__(cls,*args,**kwargs)
            cls._instance = super().__new__(cls,*args,**kwargs)

        return cls._instance

• 装饰器实现time_it和count_it

import time
from functools import wraps


def time_it(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        t1 = time.time()
        ret = func(*args, **kwargs)
        cost_time = time.time()-t1
        print(cost_time)
        return ret
    return wrapper


def count_it(func):
    count = 0
    @wraps(func)
    def wrapper(*args, **kwargs):
        nonlocal count
        count += 1
        ret = func(*args, **kwargs)
        print(count)
        return ret
    return wrapper

# python2 实现
def counter(func):
    """
    A decorator that counts and prints the number of times a function has been executed
    """
    def wrapper(*args, **kwargs):
        wrapper.count = wrapper.count + 1
        res = func(*args, **kwargs)
        print "{0} has been used: {1}x".format(func.__name__, wrapper.count)
        return res
    wrapper.count = 0
    return wrapper

@time_it
@count_it
def func():
    pass

for i in range(5):
    func()

• 生成器实现斐波纳切

def fib(num):
    n,a,b = 0,0,1
    while n < num:
        yield b
        a,b = b,a+b
        n += 1

for i in fib(5):
    print(i)

算法/数据结构

• 深度优先遍历

• 设计栈

• 大数据量列表求差集的设计思路 hash、布隆过滤器

进程

• 进程消息传递与控制