Rpi python problems

Hi,

Im currently working on a raspberry pi zero timelapse project. The idea is to have a rpi zero with a cameramodule conected to it. Also conected is a wifi module wich takes up the one usb port. I want to avoid getting a usb hub.

I got a button connected which is runned by a program. when the button is pressed it runs my main program.

My main concists of a loop which takes a picture every few minutes and uploads it to my dropbox acc wia the wifi connection.

The problem lies in when i dont have a screen or are shh into the pi. I have done some reserch and figured out that the comand im using to upload to dropbox and deleating the image does not work without the shell. I have tried to fix this but havent figured it out jet. Is there an other option for uploading it and deleating the image. Im locking for a option that does not require a shell but still works fine with my code. its a python progam.

Thx in advance!!

Christofer.

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0 royleith over 9 years ago

I've always used the old os module. However, this link seems to have the answer,

http://sharats.me/the-ever-useful-and-neat-subprocess-module.html

You are using shell=true. It's used to get the enhanced features of the shell such as pipes. It does not look as though you are using shell features so use the shell=false mode.

BTW the correct usage of shell=true is to use a string of the required shell command,

call('ls -l', shell=True)

It looks as though the syntax you are using is actually that of shell=false which requires a list of the program and arguments.

call(['ls', '-l'])

So, try

call ([photofile])
call ([photerm])
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0 royleith over 9 years ago

I've always used the old os module. However, this link seems to have the answer,

http://sharats.me/the-ever-useful-and-neat-subprocess-module.html

You are using shell=true. It's used to get the enhanced features of the shell such as pipes. It does not look as though you are using shell features so use the shell=false mode.

BTW the correct usage of shell=true is to use a string of the required shell command,

call('ls -l', shell=True)

It looks as though the syntax you are using is actually that of shell=false which requires a list of the program and arguments.

call(['ls', '-l'])

So, try

call ([photofile])
call ([photerm])
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0 realringer over 9 years ago in reply to royleith

When i first encountered this problem i thought it had to do with the shell=True . I therefore tried
shell=False aparently i was on the right track. But i didnt read the documentation and therefore it probebly were some faults. I got a errormessage when i tried it and moved on with other tries to fix it.
Thanks for the link and im going to take a look at it when i get my rpi working again. I might just get my pi 3 and get the dropbox stuff sorted out tomorrow. Before i get into the ssh stuff and setting up the network again on the zero.
Thanks again

Christofer
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