Read the statement by Michael Teeuw here.
MMM-PythonPrint customisation
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 @RobCee you can do most of the dev and test using a local file , outside of MM xxx.js 
 then
 node xxx.jsat least to get your main function working… this code would work in the node helper 
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 @sdetweil super. thanks for the pointer. 
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 the docker image karsten13/magicmirror:latestdoesn’t contain python. Simplest solution for this is to use the fat imagekarsten13/magicmirror:fat, for more infos: https://khassel.gitlab.io/magicmirror/images/
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 @karsten13 thanks… the doc needs help tho The difference between latest and fat is image size and installed those words are not used above that sentence, and so didn’t mean anything to me… I would propose adding in front of that sentence There are two images of each type created latest and fat docker pull image_name:latest or docker pull image_name:fatand then I would add a new line between these sentences debian packages. For most use cases the latest image is sufficient. Some modules need dependencies which are not includes in latest, e.g
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 yes, the docs … no native english speaker so docs are always a struggle. Thanks for the hints, will update … 
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 @karsten13 and I missed the latest/fat under the TAG column of your table… tldr(lol), my apologies 
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 @sdetweil I have started fresh and am still having the same issue. 
 New install of buster, fully updated.
 Installed all the MM and node successfully.
 MM runs as expected.
 Checked that python and python3 are both available to the OS.
 Added the MMM-PythonPrint to the modules dir.[12.04.2022 11:22.45.613] [LOG] MMM-PythonPrint received a socket notification: CONFIG - Payload: [object Object] [12.04.2022 11:22.45.619] [ERROR] Whoops! There was an uncaught exception... [12.04.2022 11:22.45.640] [ERROR] ReferenceError: _this is not defined at Class.startit (/home/pi/MagicMirror/modules/MMM-PythonPrint/node_helper.js:27:24) at Class.socketNotificationReceived (/home/pi/MagicMirror/modules/MMM-PythonPrint/node_helper.js:46:9) at Socket.<anonymous> (/home/pi/MagicMirror/js/node_helper.js:109:11) at Socket.emit (node:events:390:28) at Socket.emitUntyped (/home/pi/MagicMirror/node_modules/socket.io/dist/typed-events.js:69:22) at /home/pi/MagicMirror/node_modules/socket.io/dist/socket.js:466:39 at processTicksAndRejections (node:internal/process/task_queues:78:11)This is my config section: { module:"MMM-PythonPrint", position:"center", disabled:false, config: { // name of the python process to execute (could be python3) pythonName: 'python', // command file in module folder // if false, YOU will provide the full path to the python program localfolder: true, // spawn a python pgm that writes over and over (timed maybe), but keeps running command: 'printit.py', repetative: true, // spawn a one time output script, but relaunch it every cycletime milliseconds // repretative: false, // command: 'printitonce.py', cycletime: 2000, // print debugging messages from the node_helper debug: true } },
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 @RobCee weird, sorry, typo… fixed git pull to get the update 
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 @sdetweil I found another, just up from that one - you have a missing ‘t’ in this line this.config.command=this.config.command.slice(his.config.pythonName.length)
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 @RobCee fixed… bad day at the finger farm…yikes sorry 

