How to use Python timer

王林
Release: 2023-05-12 16:43:10
forward
1469 people have browsed it

Here we develop a print_datetime function to print the current time, and also use the print_time function as a task that we need to keep executing.

# Importing the datetime module.
import datetime


def print_time(message=None):
    """
    It prints the current time, optionally preceded by a message.

    :param message: The message to print
    """
    print(message, datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S'))
Copy after login

Then, we prepare the scheduled task module apscheduler that needs to be used. You can choose the pip method to install it. This is the method I have always used.

pip install apscheduler

# Importing the BlockingScheduler class from the apscheduler.schedulers.blocking module.
from apscheduler.schedulers.blocking import BlockingScheduler
Copy after login

At this point, we can execute the business function that needs to be kept in execution state, that is, the print_datetime function here as a scheduled task.

In this way, we don’t need to use the while True infinite loop sleep method to keep the task in running status.

# Creating a scheduler object.
scheduler = BlockingScheduler()

# Adding a job to the scheduler.
scheduler.add_job(func=print_time, args=('时间打印定时任务',), trigger='cron', second='*/1')  # 每秒执行

# Starting the scheduler in a separate thread.
scheduler.start()
Copy after login

Finally, just start the current .py file to directly execute the scheduled task. The running effect is as follows.

Time printing scheduled task 2023-02-26 13:52:52
Time printing scheduled task 2023-02-26 13:52:53
Time printing scheduled task 2023-02 -26 13:52:54
Time printing scheduled task 2023-02-26 13:52:55
Time printing scheduled task 2023-02-26 13:52:56
Time printing scheduled task 2023- 02-26 13:52:57

Of course, as the framework apscheduler for scheduled tasks, he also has many skills. For example: execution in more complex cycles, execution within a limited time, single point execution, etc.

The following is the execution method of the more common apscheduler scheduled tasks that I have listed for your reference and valuable opinions.

scheduler.add_job(func=print_time, args=('任务只执行一次,在下一次的时间执行',),
                  next_run_time=datetime.datetime.now() + datetime.timedelta(seconds=60))

scheduler.add_job(func=print_time, args=('时间打印定时任务',), trigger='interval', seconds=5)  # 每5秒执行一次
scheduler.add_job(func=print_time, args=('时间打印定时任务',), trigger='interval', minutes=2)  # 每2分钟执行一次
scheduler.add_job(func=print_time, args=('时间打印定时任务',), trigger='interval', hours=1)  # 每1小时执行一次

scheduler.add_job(func=print_time, args=('时间打印定时任务',), trigger='cron', minute='*', second='1')  # 每分钟执行一次
scheduler.add_job(func=print_time, args=('时间打印定时任务',), trigger='cron', hour='*', minute='0',
                  second='0')  # 每小时执行一次

scheduler.add_job(func=print_time, args=('时间打印定时任务',), trigger='cron', hour='20', minute='0',
                  second='0')  # 每天20:00执行一次
scheduler.add_job(func=print_time, args=('时间打印定时任务',), trigger='cron', hour='21')  # 每天21:00执行一次
Copy after login

The above is the detailed content of How to use Python timer. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:yisu.com
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!