最近准备去面试了,总结一下可能会问到的知识点
python 问的最多的就是多线程了,GIL 锁,
有的还可能会问进程(通信,生产者消费者模式),协程,异步
垃圾回收,上下文,锁(乐观锁,悲观锁),事务,队列
还有一个链表这个可能问的比较少
一些基本的算法,力扣上面的,去重,排序,数组合并,双指针(对撞指针,快慢指针)

import threading
import time

'''
@File    :   my_thread.py
@Time    :   2022/02/17 13:59:59
@Author  :   Kevin.zhao
@Version :   1.0
@Desc    :   线程
'''



money = 1
def Order(n):
    global money
    money = money + n
    money = money - n

class thread(threading.Thread):
    def __init__(self, threadname):
        threading.Thread.__init__(self, name='线程' + threadname)
        self.threadname = int(threadname)

    def run(self):
        for i in range(100):
            lock.acquire() # 死锁
            Order(self.threadname)
            lock.release()  #解锁
#        print('%s:Now timestamp is %s'%(self.name,time.time()))

lock = threading.Lock()
t1 = thread('1')
t2 = thread('5')
t1.start() #开启线程
t2.start()
t1.join() # 阻塞线程,相当于集合点
t2.join()
print(money)



import threading,time

def TestA():
    cond.acquire()
    print('李白:看见一个敌人,请求支援')
    cond.wait()  # 线程挂起,直到收到一个 Notify() 通知或者超时(可选参数),wait() 必须在线程得到 Rlock 后才能使用
    print('李白:好的')
    cond.notify()
    cond.release()

def TestB():
    time.sleep(2)
    cond.acquire()
    print('亚瑟:等我...')
    cond.notify()  #在线程挂起的时候,发送一个通知,让 wait() 等待线程继续运行,Notify() 也必须在线程得到 Rlock 后才能使用。 Notify(n=1),最多唤醒 n 个线程。
    # NotifyAll 在线程挂起的时候,发送通知,让所有 wait() 阻塞的线程都继续运行。
    cond.wait()
    print('亚瑟:我到了,发起冲锋...')

if __name__=='__main__':
    cond = threading.Condition()
    testA = threading.Thread(target=TestA)
    testB = threading.Thread(target=TestB)
    testA.start()
    testB.start()
    testA.join()
    testB.join()


from multiprocessing import Process,Queue
import time,random,os

'''
@File    :   my_process.py
@Time    :   2022/02/17 15:16:59
@Author  :   Kevin.zhao
@Version :   1.0
@Desc    :   进程
'''



def consumer(q):
    while True:
        res=q.get()
        if res is None:
            break #收到结束信号则结束
        time.sleep(random.randint(1,3))
        print(f'吃{os.getpid()}{res}')

def producer(q):
    for i in range(10):
        time.sleep(random.randint(1,3))
        res='包子%s' %i
        q.put(res)
        print(f'生产{os.getpid()}{res}')
    q.put(None) #发送结束信号
if __name__ == '__main__':
    q=Queue()
    #生产者们:即厨师们
    p1=Process(target=producer,args=(q,))

    #消费者们:即吃货们
    c1=Process(target=consumer,args=(q,))

    #开始
    p1.start()
    c1.start()
    print('主')
import asyncio
import time
'''
@File    :   my_asyncio.py
@Time    :   2022/03/08 16:56:23
@Author  :   Kevin.zhao
@Version :   1.0
@Desc    :   None
'''



async def coroutine_example(name):
    print('正在执行name:', name)
    # await asyncio.sleep(1)
    print('执行完毕name:', name)

loop = asyncio.get_event_loop()

tasks = [coroutine_example("一号"),coroutine_example("二号"),coroutine_example("三号"),coroutine_example("四号")]
wait_coro = asyncio.wait(tasks)
loop.run_until_complete(wait_coro)
loop.close()
import contextlib

'''
@File    :   context.py
@Time    :   2022/03/08 16:57:34
@Author  :   Kevin.zhao
@Version :   1.0
@Desc    :   上下文
'''



class Resource():
    def __enter__(self):
        print('===connect to resource===')
        return self
    def __exit__(self, exc_type, exc_val, exc_tb):
        print('===close resource connection===')

    def operate(self):
        print('===in operation===')

with Resource() as res:
    res.operate()



@user21nager
def open_func(file_name):
    # __enter__方法
    print('open file:', file_name, 'in __enter__')
    file_handler = open(file_name, 'r')

    # 【重点】:yield
    yield file_handler

    # __exit__方法
    print('close file:', file_name, 'in __exit__')
    file_handler.close()
    return

with open_func('/Users/MING/mytest.txt') as file_in:
    for line in file_in:
        print(line)


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