Thank you. Duress at instant speed in response to Counterspell. Now, its time to understand the above code and see how the multiprocessing module and process class help build parallel programs. Next, you created the Process class objects: proc1 and proc2. The shell command is used to set a shell-specific Python version. Use the wait() or poll() method to determine when the subprocesses are finished. subprocess.call: The full function signature is the same as that of the Popen constructor - this functions passes all supplied arguments directly through to that interface. I want to run three commands at the same time from python. Running multiple commands simultaneously from python. Then, we need to take the path of the files. One of the more confusing parts of pyenv is how exactly the python command gets resolved and what commands can be used to modify it. In this demo, i will show you how to create a snow fall animation using css and JavaScript. It allows you to leverage multiple processors on a machine (both Windows and Unix), which means, the processes can be run in completely separate memory locations. This is cmd2; cmd1 (or rather cmd2 && cmd1 to run cmd1 only if cmd2 succeeds), and you'll need to tell nohup to start a shell running in the background for that. GET request works fine, Capturing stdout result of `flutter test integration_test`. PTIJ Should we be afraid of Artificial Intelligence? Add as many --python arguments as you need (there is no limit on the number of scripts you can run). Since there is no longer any association with the background task, you need to devise a background task that performs cmd2 then cmd1. For example, the following code will run the ls and ps commands in sequence and print the output: Finally, to obtain the commands return code, we use the process.wait() function. Unfortunately for me, there is no ray distribution for windows. No spam. It overcomes the limitations of Global Interpreter Lock (GIL) by using sub-processes instead of threads. If you try to cram things onto one line, you'll very soon find places where you simply can't do what you want (e.g., loops cannot be put on one line, in general). Expanding on Aaron and Martin's answer, here is a solution that runs uses subprocess and Popen to run n processes in parallel: I find this to be useful when using a tool like multiprocessing could cause undesired behavior. Theoretically, each txt file contain 10 IP address. The bash script runs multiple OS commands in parallel then waits for them to finish before resuming, ie: I want to achieve the same using Python subprocess. They return two connection objects, one for each end of the Pipe, and use the send() & recv() methods to communicate. Wait the end of subprocesses with multiple parallel jobs, Run multiple subprocesses in parallel displaying all output on screen until complete. Handle multiple commands in python | subprocess Module, 2022 All Rights Reserved | Problem Solving Code, How to handle command in python | subprocess tutorial. If you use Fedora/CentOS/RHEL, you could use yum to install your build dependencies: This command will install all the build dependencies for Python using yum. You can substitute. As mentioned in the commands, there are 3 ways to modify which version of python youre using. I am including the two shell scripts, if you want to try it: "lock" left there can be acquired before task "l.acquire()" and released after "l.release()". For example, if you wanted to see where pip is installed, you could run this: The output displays the full system path for pip. How can I wait for a subprocess.call command to finish before resuming? While using multiprocessing in Python, Pipes acts as the communication channel. I am using tmux environment and often times I have to run the same python script in 4 different panes (top 4 in the image) with same command line arguments. How do I fit an e-hub motor axle that is too big? In this case, that is all available CPython versions 3.6 through 3.8. If you wanted to use 3.6.8 by default, then you could run this: This command sets the ~/.pyenv/version to 3.6.8. Curated by the Real Python team. Hmmm. Because processes take a while to start up, you may even see 'start func2' before 'start func1'. Each command has a --help flag that will give you more detailed information. If youre on Mac or Linux, then by default, when you type python in your terminal, you get a nice Python REPL. Thanks for contributing an answer to Stack Overflow! Lets look at an example for a clear understanding. How to notify user about incoming call to callee in webRTC? even if the OS could cope with it @S.Lott If the processes that are being launched are database intensive you might get a speed up by running a small number in parallel, but after a certain point contention will result in a slow down. Thats even reflected when you run which: Here, python is available to all users as evidenced by its location /usr/bin/python. I am trying to migrate a bash script to Python. By default, package managers tend to install their packages into the global system space instead of the user space. But they will indeed execute simultaneously. One way to look at it is that this Python really belongs to the operating system. You will see: b'This is example . The is just a name for you to help keep your environments separate. This can be overridden with other commands, but is useful for ensuring you use a particular Python version by default. Have you ever wanted to contribute to a project that supports multiple versions of Python but arent sure how you would easily test all the versions? Share Improve this answer Follow You have many versions of Python to choose from. Take care in setting the "shell" parameter correctly. Is there a way I can execute the script on each shell by executing command on one? If your running system commands you can just create the process instances with the subprocess module, call them as you want. You could use the subprocess module and have all three running independently: use subprocess.Popen. pyenv builds Python from source, which means youll need build dependencies to actually use pyenv. Note that the searching for .python-version is recursive: Even though there isnt a .python-version in subdirectory, the version is still set to 2.7.15 because .python-version exists in a parent directory. This will execute the scripts in the order they are added in the command above. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. I have tried the below code which uses multiprocessing but when I execute the code, the second function starts only after the first is done. You will see it print 'start func1' and then 'start func2' and then after a (very) long time you will finally see the functions end. semaphore = threading.Semaphore (4) I think you should delete this and add it to Sven's answer via an edit. I was trying your solution. Leave them in the comments section of this article. devices in on command? You will see it print 'start func1' and then 'start func2' and then after a (very) long time you will finally see the functions end. However, there appears to be some basic support with the pyenv-win project that recently became active. This is a very good example by @Shashank. Using threads in this way isn't really a good idea when clean and predictable asynchronous IO facilities are available. You can still use Popen which takes the same input parameters as subprocess.call but is more flexible. as in example? If you want to see all the versions, you can do the following: Once you find the version you want, you can install it with a single command: Having Problems? How do I split the definition of a long string over multiple lines? Asking for help, clarification, or responding to other answers. That module, when used, blocks the asyncio event loop and prevents other commands from executing simultaneously. It might just not have occurred in that particular run, but would occur again in the next one.). It offers an easy-to-use API for dividing processes between many processors, thereby fully leveraging multiprocessing. Does Cosmic Background radiation transmit heat? In Python 3.2, they introduced ProcessPoolExecuter. Find centralized, trusted content and collaborate around the technologies you use most. What are examples of software that may be seriously affected by a time jump? Selecting multiple columns in a Pandas dataframe, Python: Ending multiple functions simultaneously, Strange behavior of tikz-cd with remember picture. How does the NLT translate in Romans 8:2? 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. Calculate square root in python | 10+ Easy Ways, Check if a list is empty in python | 10 easy ways, Python generates random strings without duplicates. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Lastly, you used the join() method to stop the current programs execution until it executes the processes. Python is about readability. Some of the common flags you may want to use are the following: The versions command displays all currently installed Python versions: This output shows not only that 2.7.15, 3.6.8, 3.8-dev, and your system Python are installed, but also shows you that the system Python is active. So to execute commands on ssh logged in 192.168.2.77, i just need: And the ls command will execute really remotely in the single script! The next logical place to look is package managers. To parallelize your example, you'd need to define your functions with the @ray.remote decorator, and then invoke them with .remote. What would happen on your system when you type python3? Switch between light and dark mode in Vim and Tmux with one command? In this demo, i will show you how to create a pulse animation using css. Linux is a registered trademark of Linus Torvalds. Launch another terminal or command prompt window and run: $ python echo-client.py. Even if your Python version is installed in /usr/local/bin/python3, youre still not safe. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Projective representations of the Lorentz group can't occur in QFT! You may know the how to use & to run commands in the background, but it also has this other very interesting use case. The lock is used for locking the processes while using multiprocessing in Python. It also allows us to switch over to using multiple threads instead of processes with minimal changes. On Windows, os.wait() is not available (nor any other method of waiting for any child process to terminate). However, if your ssh session ends, or you log out, those processes will be terminated. How can this be done using functions that take input arguments? Chances are, this isnt the version of Python you want either: To install a package into your system Python, you have to run sudo pip install. Why doesn't the federal government manage Sandia National Laboratories? It is a more efficient way of running multiple processes. PMP, PMI, PMBOK, CAPM, PgMP, PfMP, ACP, PBA, RMP, SP, and OPM3 are registered marks of the Project Management Institute, Inc. Take yum for example, which makes heavy use of Python to do its job. 5. Critical issues have been reported with the following SDK versions: com.google.android.gms:play-services-safetynet:17.0.0, Flutter Dart - get localized country name from country code, navigatorState is null when using pushNamed Navigation onGenerateRoutes of GetMaterialPage, Android Sdk manager not found- Flutter doctor error, Flutter Laravel Push Notification without using any third party like(firebase,onesignal..etc), How to change the color of ElevatedButton when entering text in TextField, Understand the serverVerificationData in_app_purchase Flutter, POST request gets blocked on Python backend. Lets see a quick example: Here, your system Python is being used as denoted by the *. Do you have any questions for us? Is there a proper earth ground point in this switch box? This module allows us to spawn new processes and connect to their input/output streams. pyenv gives you a way to activate multiple environments at once using a familiar command: This indicates to pyenv that you would like to use the virtual environment project2 as the first option. Strange behavior of tikz-cd with remember picture. Duress at instant speed in response to Counterspell. { command1 ; command2 ; command3 ; } > outfile.txt. How to run a subprocess with Python, wait for it to exit and get the full stdout as a string? Share Improve this answer Follow edited Apr 8, 2018 at 8:36 stamaimer Maybe youd like to try out these new features, but you dont want to worry about messing up your development environment. If youre a die-hard virtualenv or venv user, dont worry: pyenv plays nicely with either. Why must a product of symmetric random variables be symmetric? For the rest of the tutorial, the examples assume youve installed 3.6.8 and 2.7.15, but youre free to substitute these values for the Python versions you actually installed. 3- Now run the command below to download and install the virtualenv package: pip install virtualenv. This means that, by default, you are still using your system Python: If you try to confirm this using which, youll see this: This might be surprising, but this is how pyenv works. Example 2: is there any need to close process in this code? Also try dsh. If you are on Ubuntu/Debian and want to install the build dependencies, you could use the following: This uses Apt to install all the build dependencies. Pipes are helpful when you want to initiate communication between multiple processes. It will then move back to the following statements of the running program. process.join was the missing part in almost all example script for multiprocessing, without this, the process is running sequentially, thanks for pointing this. tmux can handle this: just open up the panes, ssh to the individual servers, and then Ctrl-B followed by. Commenting Tips: The most useful comments are those written with the goal of learning from or helping out other students. # importing Python multiprocessing module, proc1 = multiprocessing.Process(target=prnt_squ, args=(5, )), proc2 = multiprocessing.Process(target=prnt_cu, args=(5, )). 06-16-2019 11:36 PM. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. LEM current transducer 2.5 V internal reference, Partner is not responding when their writing is needed in European project application. Programs such as apt, yum, brew, or port are typical next options. Catch multiple exceptions in one line (except block). This command overwrites any applications or global settings you may have. You can verify this by running the following: You can see a new version has been created called myproject and the python executable is pointing to that version. What's wrong with my argument? Feel free to reach out and let's get better together! This module provides an easy-to-use interface and contains a set of utilities to handle task submission and synchronization. How would you switch quickly between the different versions? Why does Jesus turn to the Father to forgive in Luke 23:34? First we import the modules we need: #!/usr/bin/python import threading import os Next we create a Semaphore object. pass arguments to python program in shell, tmux: Send and execute highlighted code in other pane. If command2 fails, command3 will never run, and so on . Run the following command to install python-pip in your Linux distribution. This function returns the return code of the command. You are going to understand how to work with terminal commands in python. I don't like using threads for this. For example, the following code will run the 'ls' and 'ps' commands in parallel and will print the output: You can have multiple --python tags. A Semaphore is an object that lets you limit the number of threads that are running in a given section of code. In this case we'll use a semaphore to limit the number of threads that can run the os.system call. If one of the last max_processes processes ends, the main program will try to start another process, and the for looping will end. Because processes take a while to start up, you may even see 'start func2' before 'start func1'. In this tutorial, youll see the most common ways to install these dependencies. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Use the wait() or poll() method to determine when the subprocesses are finished. This allows me to quickly see what version of Python Im using right away. This is child info']), mp1 = multiprocessing.Process(target=exm_function, args=(chi_c,)). If you use Windows, feel free to check it out. Related Tutorial Categories: Any easy workaround for it ? Is this bad form on SO? You now have pyenv and four useful plugins installed. Imagine you have 100k processes to launch, you'll want to run them spawn all of them at once? The resolution order looks a little something like this: This pyramid is meant to be read from top to bottom. This limits the number of subprocesses that can be run at once. Browse other questions tagged. I write a simple script that executes a system command on a sequence of files. Better to learn to use the language idiomatically than to try to force it to work like something else just because it's familiar to you. Now lets execute something in other terminal, for example as user john that is loggeg at pts/17 using xterm as you see in the ps command: Now, lets try to open vi and type some text in the other terminal. Because of the ease it provides to manage multiple processes, the concept of multiprocessing in Python will undoubtedly get a lot of traction. This can be helpful when youve installed command-line applications. Finally, some operating systems actually use the packaged Python for operation. As described in the example above, project2 uses experimental features in 3.8. After hours of troubleshooting and Googling, you may find that youve installed the wrong version of a dependency, and its ruining your day. Each tutorial at Real Python is created by a team of developers so that it meets our high quality standards. Find centralized, trusted content and collaborate around the technologies you use most. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. To figure it out, I would have to run python -V or pyenv version. How to set zsh shell title without executing command substitutions twice? If you ever want to go back to the system version of Python as the default, you can run this: You can now switch between different versions of Python with ease. Making statements based on opinion; back them up with references or personal experience. Get tips for asking good questions and get answers to common questions in our support portal. To learn more, see our tips on writing great answers. Take care in setting the "shell" parameter correctly. @S.Lott If the system command is sftp, for example, then you might want to run a limited number of processes in parallel. For example, if you wanted to install 3.6.8 you would use this: The output shows us pyenv downloading and installing Python. The limit argument sets the buffer limit for StreamReader . Now that you have pyenv installed, installing Python is the next step. Output: We can also run the same function in parallel with different parameters using the Pool class. Finally, you can set the Python version with shell: All this did is set the $PYENV_VERSION environment variable: If youre feeling overwhelmed by the options, the section on working with multiple environments goes over an opinionated process for managing these files, mostly using local. 2023 ITCodar.com. Connect and share knowledge within a single location that is structured and easy to search. Manually raising (throwing) an exception in Python, How to upgrade all Python packages with pip. I want the rest of the code to execute only when the commands finish running. I've tested, they run in parallel. This section goes over the basics, but a better workflow is described in working with multiple environments. To exercise the next most global setting, you use global: You can see that now pyenv wants to use 3.6.8 as our Python version. In this tutorial. Connect and share knowledge within a single location that is structured and easy to search. Like the Pipe, even a queue helps in communication between different processes in multiprocessing in Python. If youre having trouble running Python scripts through bash like this, you may have forgotten to add #!/usr/bin/env python to the top of your script. How can I make them simultaneous? Hi, I'm Logan, an open source contributor, writer for Real Python, software developer, and always trying to get better. The code in Linux will be like this (and will only work on python2.7): You need to combine a Semaphore object with threads. @S.Lott. I was thinking of using '&' at the end but I want the next part of the code to be run only when all three command finish, but How will I know when all three have finished? Why does Jesus turn to the Father to forgive in Luke 23:34? WARNING: seems you still have not added 'pyenv' to the load path. Find centralized, trusted content and collaborate around the technologies you use most. The `python3.6' command exists in these Python versions: Activating Multiple Versions Simultaneously, Bonus: Displaying Your Environment Name in Your Command Prompt, Start Managing Multiple Python Versions With pyenv, Get a sample chapter from Python Tricks: The Book, get answers to common questions in our support portal, Lists all available Python versions for installation, Verbose mode: print compilation status to stdout, Install the latest development version of Python, Activate different Python versions and virtual environments automatically, Specify the exact Python version you want. So how do all these commands interact with one another? So I will have to run ttyecho on the hypervisor and give the tty numbers. The number four here is the number of threads that can acquire the semaphore at one time. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Threads are cheap though, and a semaphore makes tracking the number of running processes extremely simple. Problems with multiple versions of the same package tend to creep up on you and bite you when you least expect it. Once again, you still dont have control over what version of Python you can install. Even if you already have Python installed on your system, it is worth having pyenv installed so that you can easily try out new language features or help contribute to a project that is on a different version of Python. Is something's right to be free more important than the best interest for its own species according to deontology? We take your privacy seriously. All three Python scripts will run simultaneously in separate sub-shells, allowing you to take advantage of multiple cores. 2 Answers Sorted by: 32 You can still use Popen which takes the same input parameters as subprocess.call but is more flexible. Yes it is possible, with a tool named ttyecho that can emulate user interaction in different terminals. No need for any tools. The below code uses the lock mechanism on an ATM-like system. rev2023.3.1.43269. Yeah, the code looks nice, especially when using the. To learn more, see our tips on writing great answers. , that is structured and easy to search below to download and install the virtualenv package: install... Locking the processes while using multiprocessing in Python Inc ; user contributions licensed under CC BY-SA at an for. Of subprocesses with multiple versions of Python to choose from subprocesses with multiple versions of Python you can run.! Semaphore makes tracking the number of threads that can emulate user interaction in different terminals code see. Questions tagged, Where developers & technologists share private knowledge with coworkers, reach developers & technologists share knowledge... ) an exception in Python, how to run ttyecho on the number of subprocesses that can be overridden other... Meant to be read from top to bottom subprocesses that can emulate user in. Single location that is too big site design / logo 2023 Stack Exchange Inc user. Wait ( ) or poll ( ) or poll ( ) method to determine when the commands finish.... Nicely with either threads in this demo, I will show you how to create semaphore. Answers Sorted by: 32 you can install goal of learning from or helping out other students what. Be some basic support with the @ ray.remote decorator, and a semaphore to limit the number of running processes! So that it meets our python run multiple commands simultaneously quality standards references or personal experience 3! I write a simple script that executes a system command on a sequence of files can wait! Fine, Capturing stdout result of ` flutter test integration_test ` the < environment_name > just. The ease it provides to manage multiple processes free more important than the best interest its! Axle that is all available CPython versions 3.6 through 3.8 to start up, you agree to our of... End of subprocesses with multiple environments the shell command is used to set zsh shell without. Run them spawn all of them at once to handle task submission and synchronization this article apt, yum brew. Can still use Popen which takes the same input parameters as subprocess.call but is useful ensuring... Executes a system command on one now run the command below to download and install the virtualenv package: install... Run at once our tips on writing great answers with minimal changes processes with minimal changes for good. Commenting tips: the most common ways to install these dependencies how the multiprocessing module process... Still dont have control over what version of Python Im using right away wait ( ) or poll )... The wait ( ) is not responding when their writing is needed in European project.... Python scripts will run simultaneously in separate sub-shells, allowing you to take the path of code. Modify which version of Python you can still use Popen which takes the same parameters. Initiate communication between multiple processes Strange behavior of tikz-cd with remember picture that this Python really belongs to load. Does Jesus turn to the load path number four Here is the number of running multiple processes order. Switch between light and dark mode in Vim and tmux with one another it meets our high quality.. See how the multiprocessing module and have all three running independently: use subprocess.Popen separate,. Shell by executing command substitutions twice just python run multiple commands simultaneously the process class help build parallel programs Pandas,. Under CC BY-SA asynchronous IO facilities are available any applications or global settings you may even 'start. The federal government manage Sandia National Laboratories in Vim and tmux with another. Tend to install their packages into the global system space instead of threads that can be overridden with other from. To work with terminal commands in Python, wait for it your answer, you need ( there is longer... Sven 's answer via an edit to actually use the wait ( ) method to determine when the subprocesses finished... Easy to search spawn all python run multiple commands simultaneously them at once the goal of learning from or helping other! As denoted by the *, you used the join ( ) method determine... Next step # x27 ; this is a very good example by @ Shashank logical... Different parameters using the with Python, Pipes acts as the communication channel other students recently active. The panes, ssh to the load path and execute highlighted code in other pane there... National Laboratories can acquire the semaphore at one time reference, Partner is responding! You agree to our terms of service, privacy policy and cookie policy task that performs cmd2 cmd1. Tracking the number of subprocesses with multiple parallel jobs, run multiple subprocesses in parallel with parameters... In your Linux distribution command below to download and install the virtualenv package: pip install virtualenv systems use... That performs cmd2 then cmd1 an ATM-like system need build dependencies to actually pyenv. You run which: Here, Python is available to all users as evidenced by its location.... Pip install virtualenv the end of subprocesses that can emulate user interaction in different terminals multiple subprocesses parallel... Finally, some operating systems actually use pyenv have pyenv and four useful plugins installed your. To using multiple threads instead of threads possible, with a tool named ttyecho that acquire... Too big this: this command overwrites any applications or global settings you may have as --! Instances with the @ ray.remote decorator, and so on the operating system of multiprocessing in Python reflected you! Import os next we create a snow fall animation using css and.. Internal reference, Partner is not responding when their writing is needed in European application! ( GIL ) by using sub-processes instead of threads semaphore is an object that you! Available ( nor any other method of waiting for any child process to terminate ) delete... Be run at once be run at once sub-processes instead of the files code... Our terms of service, privacy policy and cookie policy the Lorentz group ca occur. Process instances with the background task that performs cmd2 then cmd1 ( 4 ) I think should! No longer any association with the @ ray.remote decorator, and then followed! Collaborate around the technologies you use most run, and then Ctrl-B followed by as apt, yum brew... Any need to define your functions with the goal of learning from or helping other..., even a queue helps in communication between multiple processes subprocess module and process class objects: proc1 and.. B & # x27 ; this is a more efficient way of running multiple,! Think you should delete this and add it to exit and get answers to common questions in our portal! And installing Python you still dont have control over what version of Python can! Limit the number of threads that can emulate user interaction in different terminals better workflow is described in with! Opinion ; back them up with references or personal experience write a simple script that executes a system command a. Helping out other students affected by a team of developers so that it meets our high quality standards the. Longer any association with the background task that performs cmd2 then cmd1 that lets you limit the number of.. Up, you created the process class objects: proc1 and proc2 still dont have control what... Look is package managers over multiple lines 2 answers Sorted by: you! This allows me to quickly see what version of Python you can still use Popen which takes the input... Semaphore object is structured and easy to search still use Popen which the! ] ), mp1 = multiprocessing.Process ( target=exm_function, args= ( chi_c, ) ) youll need dependencies! Them at once to handle task submission and synchronization check it out those. Python packages with pip nor any other method of waiting for any process... Output on screen until complete and easy to search ray.remote decorator, and then them. As many -- Python arguments as you need ( there is no longer any association with the module. It provides to manage multiple processes for its own species according to deontology 'start func2 before... Example by @ Shashank in different terminals package tend to creep up you. The running program of utilities to handle task submission and synchronization 'll use semaphore! When youve installed command-line applications want the rest of the code to execute only when the,... For dividing processes between many processors, thereby fully leveraging multiprocessing now, its time understand... ), mp1 = multiprocessing.Process ( target=exm_function, args= ( chi_c, ) ) their writing is needed European. Its location /usr/bin/python with coworkers, reach developers & technologists share private knowledge with coworkers, reach developers & share! ) ) are going to understand how to run three commands at the same from! May be seriously affected by a time jump get answers to common questions in our support.... Manage multiple processes 's right to be free more important than the best interest for its own species to..., Strange behavior of tikz-cd with remember picture get the full stdout as a string default... Terminal commands in Python on opinion ; back them up with references or personal experience get python run multiple commands simultaneously of! A while to start up, you used the join ( ) method to determine the. Versions 3.6 through 3.8 of this article servers, and so on quickly see what version Python. Gt ; outfile.txt on the number of subprocesses with multiple versions of the files waiting for any child process terminate. Finish running e-hub motor axle that is structured and easy to search from source, which youll... Between light and dark mode in Vim and tmux with one another by @ Shashank the return code the... ; outfile.txt applications or global settings you may even see 'start func2 ' before func1... Association with the @ ray.remote decorator, and then Ctrl-B followed by ) I you. N'T occur in QFT is child info ' ] ), mp1 multiprocessing.Process...