在实例调用的函数中加入打印当前线程的名字，分别用start()方法和run()方法启动线程检查有什么区别：
start()
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import threading
import time
def worker():
count = 1
while True:
if count >= 6:
break
time.sleep(1)
count += 1
print("thread name = {}".format(threading.current_thread().name))#当前线程名
t = threading.Thread(target=worker,name="MyThread")
t.start()
print("===end===")
运行结果：
===end===
thread name = MyThread #
thread name = MyThread
thread name = MyThread
thread name = MyThread
thread name = MyThread
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从上面例子中打印的线程名字来看，使用start()方法启动的线程名是我们定义线程对象时设置的name="MyThread"的值，如果没有设置name参数值，则会打印系统分配的Thread-1,Thread-2...这样的名称。
run()方法
import threading
import time
def worker():
count = 1
while True:
if count >= 6:
break
time.sleep(1)
count += 1
print("thread name = {}".format(threading.current_thread().name))
t = threading.Thread(target=worker,name="MyThread")
t.run()
print("===end===")
运行结果：
thread name = MainThread #
thread name = MainThread
thread name = MainThread
thread name = MainThread
thread name = MainThread
===end===
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上面例子中，使用的是用run()方法启动线程，它打印的线程名是MainThread，也就是主线程。
再看下多线程时的例子：
start()：
import threading
import time
def worker():
count = 1
while True:
if count >= 6:
break
time.sleep(1)
count += 1
print("thread name = {}, thread id = {}".format(threading.current_thread().name,threading.current_thread().ident))
t1 = threading.Thread(target=worker,name="t1")
t2 = threading.Thread(target=worker,name='t2')
t1.start()
t2.start()
print("===end===")
运行结果：
===end===
thread name = t1, thread id = 6032
thread name = t2, thread id = 880
thread name = t1, thread id = 6032
thread name = t2, thread id = 880
thread name = t2, thread id = 880
thread name = t1, thread id = 6032
thread name = t1, thread id = 6032
thread name = t2, thread id = 880
thread name = t2, thread id = 880
thread name = t1, thread id = 6032
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上面例子中，start()方法启动了两个新的子线程并交替运行，每个子进程ID也不同。
run()：
import threading
import time
def worker():
count = 1
while True:
if count >= 6:
break
time.sleep(1)
count += 1
print("thread name = {}, thread id = {}".format(threading.current_thread().name,threading.current_thread().ident))
t1 = threading.Thread(target=worker,name="t1")
t2 = threading.Thread(target=worker,name='t2')
t1.run()
t2.run()
print("===end===")
运行结果：
thread name = MainThread, thread id = 2000
thread name = MainThread, thread id = 2000
thread name = MainThread, thread id = 2000
thread name = MainThread, thread id = 2000
thread name = MainThread, thread id = 2000
thread name = MainThread, thread id = 2000
thread name = MainThread, thread id = 2000
thread name = MainThread, thread id = 2000
thread name = MainThread, thread id = 2000
thread name = MainThread, thread id = 2000
===end===
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上面例子中，两个子线程都用run()方法启动，但却是先运行t1.run()，运行完之后才按顺序运行t2.run()，两个线程都工作在主线程，没有启动新线程，因此，run()方法仅仅是普通函数调用。
一个进程中至少有一个线程，并作为程序的入口，这个线程就是主线程。
一个进程至少有一个主线程，其它线程称为工作线程。
总结：
好了，从上面四个小例子，我们可以总结出：
- start() 方法是启动一个子线程，线程名就是我们定义的name
- run() 方法并不启动一个新线程，就是在主线程中调用了一个普通函数而已。
因此，如果你想启动多线程，就必须使用start()方法
标签：run,name,thread,threading,MainThread,start,线程,多线程,id From： https://www.cnblogs.com/yogayao/p/17846780.html