Python之路——多线程

Thread

# from threading import Thread
# import time
# import os
# def func(i):
#     time.sleep(1)
#     print('helloworld',i,os.getpid())
# thread_lst = []
# for i in range(10):
#     t = Thread(target=func,args=(i,))
#     t.start()
#     thread_lst.append(t)
# [t.join() for t in thread_lst]
# print(os.getpid())

定义自己的Thread类

# from threading import Thread
# import time,os
# n = 0
# class MyThread(Thread):
#     # n = 0
#     # def __init__(self):
#     #     MyThread.n += 1
#     def run(self):
#         time.sleep(1)
#         print('helloworld',n,os.getpid())
#
# l = []
#
# def func(i,l):
#     l.append(i)
#
# for i in range(20):
#     t = MyThread()
#     t.start()

等待开启的线程执行完

# from threading import Thread
# import time,os,random
#
# def func(i):
#     time.sleep(random.random())
#     print('hello %s'%i,os.getpid())
#
# tl = []
# for i in range(10):
#     t = Thread(target=func,args=(i,))
#     t.start()
#     tl.append(t)
#
# [t.join() for t in tl]

有段thread的一些属性

# from threading import Thread
# import time,os,random
#
# class MyThread(Thread):
#     count = 0
#     def __init__(self,arg1,arg2):
#         super().__init__()
#         self.arg1 = arg1
#         self.arg2 = arg2
#     def run(self):
#         MyThread.count += 1
#         time.sleep(random.random())
#         print('%s,%s,%s,%s'%(self.arg1,self.arg2,self.name,os.getpid()))
# for i in range(10):
#     t = MyThread(i,i*'*')
#     t.start()
# print(t.count)  # 计算开启的线程数量

from threading import Thread
import threading
import time,os,random
def func(i):
    # print(len(threading.enumerate()))
    time.sleep(random.random())
    print(i,threading.current_thread().name,threading.current_thread().ident)
for i in range(10):
    t = threading.Thread(target=func,args=(i,))
    t.start()
# print('main:',len(threading.enumerate())) # # 返回正在运行着的线程列表
time.sleep(random.random())
# print('main:',len(threading.enumerate()))
print(threading.active_count())