The difference between the start () and run () methods of the thread class in Python __python

Both of these methods can start thread activity, but their differences are similar to the difference between start () and run () in the Java thread class.

First look at the Official document description:

Translation is:

Start () method

Start thread activity.

It can only be invoked once for each thread object, and it arranges the object to call the Run () method (not the current thread) in an additional separate thread.

When the method is invoked more than once in the same thread object, a RuntimeError (run-time error) is introduced.

Run () method

Represents a method of thread activity.

You can override this method in subclasses. The standard run () method calls the adjustable object that is passed to the object's constructor as the target parameter, and if so, the order and keyword parameters are obtained from args and Kargs respectively.

The following code was written to test:

#!/usr/bin/python
# coding=utf-8

Import Threading

Class Mythread (threading. Thread):
    def __init__ (self, ThreadID, name, counter):
        Threading. Thread.__init__ (self)
        self.threadid = ThreadID
        self.name = name
        Self.counter = Counter

    def run (self):
        currenttreadname = Threading.currentthread ()
        print "Running in", currenttreadname

thread = mythread (1, "Mythrd", 1)
Thread.run ()
Thread.Start ()

Mythread inherits from the thread class, I rewrite its constructor and run () method, the run () method obtains the current thread name by CurrentThread () and prints with the print function

The program then executes the run () and the Start () method separately

The output results are as follows:

You can see two methods in Mainthread and Mythread threads, respectively