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The topics incorporated in the video are how to share data between processes using multiprocessing queue in python with appropriate examples, what is queue, how to create a queue, method of queue and classes of queue, how to communicate between two process in python, how to use “queue” to store results of square function, how to create queue variable in Multiprocessing Queue class, what is queue class method put(), what is Queue data structure FIFO, what is the difference between multiprocessing queue and queue module and the use of queue class method empty() as well as get().
Topics that are covered in this Python Video:
0:03 How to share data between processes using multiprocessing queue in python
0:15 Example
1:40 How to communicate between two processes in python
2:06 Use “queue” to store results of the square function
2:17 create queue variable in Multiprocessing Queue class
2:55 Queue class method put()
2:58 What is Queue data structure FIFO(First In First Out)
3:30 Queue class method empty(), get()
5:11 Difference between Multiprocessing queue vs queue module
Code used in this tutorial:
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Python Tutorial – 30. Multiprocessing Lock:
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What if I'm not trying to process to a queue, but rather from a queue. I want the arguments my process sends to the function to be gotten from my queue
Not getting result in Visual Studio
Hi, very good video, would like to know about data sharing using Manager. Hope you can make a video on that… for some reason I I have to use manager.list() to share data between processes, but it seems the data cannot shared to a function that inside a class…
fabulous.
Thank you so much this helped me a lot.
can not run multiprocessing in pycharm, but in IDLE it's works just fine.
PermissionError: [WinError 5] Access is denied ( I already ckecked to run it as administrator )
( n * n )… that is a fat cat covering eyes with its paws
Thank you so much for the clear illustration! 🙂
Here is my question:
I am running a simulation using multiprocessing, and if I want to extract the results, output, from one simulation run (process) and have it input for the other process, how can I do that?
When you also add the memory ref in print statement: f'outside process: {result}. Memory ref: {id(result)}', then in your example `result` has the same memory address inside of the method and in the __main__, meaning they are pointing to the same thing. So I do not understand how they are not sharing the memory if they are pointing to the same variable in memory?
Thanks so much
Sorry that i cant say this on all your vids but. They are fucking good and get the message right. Very very understandable and one of the only ones that is on this level. Keep posting haha
At time 1:36, if executing in python 3.6 i am getting result outside the child process as well
Thank you for all of your excellent videos. Much appreciated. Quick question (but maybe long answer): I wrote a program and made an interface with PyQt5. While the program is running, the interface is not responsive, until the program finishes. Would the solution be multiprocessing?
Great work!
you say is shared memory, but isn't queue a pipe?
If I put time.sleep(1) in my process, nothing gets printed for several seconds, then the numbers seem to be printed almost simultaneously. So it seems like the program is essentially waiting until the process finishes before going on to the while statement. I'm confused about what exactly is going on. I thought the whole point was to process the numbers and print them as they come out.
can we use any one of those sharing methods to share images(with opencv) between two processes?
bro, is there a way to make Queue first in first out? Stack?
Thanks so much for all your multiprocessing tutorials!
Excellent tutorial. Thank you very much!
Is it possible to initiate a variable inside a function(process) and then give it back to main, or do we have to initialize it in main only?
while not q.empty() is more pythonic
while not q.empty() should be easier to read, nice tutorial
Hi I am trying to share a complex dictionary nested object carrying inputs into all my processes. how can you address that.
Nice tutorial thanks for it !
On a side note, as a substitute to "if queue.empty(): is False" could be "if not queue.empty(): "
Thanks for the tutorials! They are very well designed and moduled. I had a question on this one – Is there any specific advantage of using shared queues instead of shared arrays?
use .join() to join string :p
Not using q.join()?
sir queue and multiprocessing work in idle 2 or exactly python 2.7.9 because multithreading work fine and i don't know about the multiprocessing if work or not