This tutorial will introduce the
threading module to create and start a thread in Python.
A thread is a set of operations that need to be executed. Running threads means that the program will have two or more things running at once. A thread can only run in one core of the CPU. Threading is about how we handle the threads in one CPU core.
Thread Implementation in Python
Python uses the
threading module to implement threads in programs. You can create a
Thread instance and then call it to start a separate thread.
When you create a
Thread instance, you pass in a function and a list of arguments for that function. In this case, you are telling the
Thread to run the function
thread_function() and pass it 1 as an argument.
thread_function() logs some messages and sleeps for two seconds.
# python 3.x from threading import Thread import time import logging def thread_function(name): logging.info("Thread %s: starting", name) time.sleep(2) logging.info("Thread %s: finishing", name) if __name__ == "__main__": format = "%(asctime)s: %(message)s" logging.basicConfig(format=format, level=logging.INFO, datefmt="%H:%M:%S") thread = Thread(target=thread_function, args=(1,)) thread.start() logging.info("Exiting")
10:23:58: Thread 1: starting 10:23:58: Exiting 10:24:00: Thread 1: finishing
The flow of the program is given below. Once you call
start(), it triggers
thread_function() and it runs in a separate thread. The main program also runs in parallel as another thread.