python快速代码

Python特有简写

快速生成随机数组

random_array = [random.randint(0,100) for i in range(10)]
# 输出
[77, 76, 31, 0, 18, 17, 89, 85, 31, 13]

等价于

random_array = []
for i in range(10):
  random_array.append(random.randint(0,100))

其中i为临时变量，可使用_替代

无参数lambda使用

符号:之前无内容

f = lambda: random.randint(0,100)

Python多线程

threading

使用threading，相当于Java中的Runable或Callable

import threading
import time
import random


def print_task():
    delay = random.randint(1, 5)
    time.sleep(delay)
    print(threading.current_thread().name, "delay", delay, "seconds")


if __name__ == '__main__':
    print('当前运行的是主进程', threading.current_thread().name)
    t = threading.Thread(target=print_task, name='t-1')
    # 启动线程
    t.start()
    t.join()

线程池

推荐使用ThreadPoolExecutor，并推荐命名线程

from concurrent.futures import ThreadPoolExecutor, wait
import time
import random
import threading


def print_task():
    delay = random.randint(1, 5)
    time.sleep(delay)
    print(threading.current_thread().name, "delay", delay, "seconds")


executor = ThreadPoolExecutor(max_workers=5, thread_name_prefix="print-task")
all_future = [executor.submit(print_task) for _ in range(10)]
wait(all_future)

总结

• python菜鸟一点一点积累