threading programming in python

Question

Recently I've been practicing to build a website with flask. Now i encounter a problem.
There is a function which to achieve registration. The code like this:

    def register():
        ...
        some judgment
        ...
        if true:
        sendmail()
        return redirect(url_for('onepage'))

My question is :
When preforming sendmail(), it needs much time. So the users have to wait for a moment to get "onepage", about 4-5s. This will bring a bad experience. I know that using threading can let these two functions independently of each other, but I have learnt programming for a very short time so I have no experience in threading programming, Could anybody provide some ideas or code examples for me at this problem?

SuperShoot · Accepted Answer · 2020-01-30 22:09:41Z

5

What you want is threading rather than the low-level thread (which has been renamed to _thread in Python 3). For a case this simple, there will be no need of subclassing threading.Thread, so you could just replace sendmail() by:

threading.Thread(target=sendmail).start()

after:

import threading

edited Jan 30, 2020 at 22:09

SuperShoot

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answered Jun 1, 2013 at 9:50

Evpok

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Johannes Jasper · Accepted Answer · 2013-06-01 09:42:23Z

2

There are several ways of implementing threading in Python. One very simple solution for you would be

    import thread
    def register():
        ...
        some judgment
        ...
        if true:
        thread.start_new_thread(sendmail,())
        return redirect(url_for('onepage'))

This will start sendmail() asynchronously. However, if sendmail fails or returns something, you will need to use something else.

There are plenty of tutorials about Threading in python, I found this quite nice http://www.tutorialspoint.com/python/python_multithreading.htm

answered Jun 1, 2013 at 9:42

Johannes Jasper

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2 Comments

Ying.Zhao Over a year ago

Thanks elactic! It's really useful for me !

Johannes Jasper Over a year ago

You're, welcome. But Evpok is right, threading might be the better choice over Thread.

tbicr · Accepted Answer · 2013-06-03 06:48:52Z

1

I have not threading solution: I'm using celery for hard operations: send email, fetch url, create many database records, periodic tasks.

+ you can use flask application and celery instances on different servers

- you need backend (rabbitmq, redis, mongodb and etc.)

answered Jun 3, 2013 at 6:48

tbicr

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2 Comments

Ying.Zhao Over a year ago

ok. Thanks tbicr. I'll take a look at flask-celery. Hoping it can help me. Thanks~

tbicr Over a year ago

From celery 3.0 you can use just celery without flask-celery.

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