On Tue, 04 Apr 2017 08:01:42 -0700, venkatachalam.19 wrote: > Hello All, > > I am writing a python code for processing a data obtained from a sensor. The > data from sensor is obtained by executing a python script. The data obtained > should be further given to another python module where the received data is > used for adjusting the location of an object. > > For achieving this, there is a central bash script, which runs both the > python modules parallel. Something like: > > python a.py & > python b.py &
What is going on that two python scripts are needed? Which one generates the data needed by the bash script? > I am trying to return the sensor data to the bash .sh file, therefore it can > be provided to the other script. This, based on the online tutorials looks > like: > > sensor_data=$(python execute_sensor_process.py) & Presumably <sensor_data> is simply getting the exit status code from the python interpreter, not the data, right? What are you seeing? > and the sensor_data is assigned by printing the required data in the > corresponding python script. For example, the data is printed in > execute_sensor_process.py as follows: > > print >>sys.stderr,sens_data > > By printing the data onto sys.stderr and assigning a return variable in the > bash, I am expecting the data to be assigned. Assigned to what? Some return variable in bash? What?? Why not use stdout? Either pipe the data from python directly into a (possibly modified) bash script, or into a file which gets read by the bash script. > But this is not happening. The sensor data is a dictionary and I like to have > this data for further analysis. I am not getting the data returned from the > python script on to the bash variable. Bash doesn't have dictionaries like python. Why is bash needed? > Can someone help me to understand why the code is not working? I tried other > approaches of function call such as You haven't given us enough of the code to really answer. > sensor_data=$`python execute_sensor_process.py` & > > python execute_sensor_process.py tempfile.txt & > kinexon_data=`cat tempfile.txt` & > > But none of the approaches are working. > > Thank you, > Venkatachalam Srinivasan I wonder if you could completely eliminate the bash script - do it all in python. I've written quite a few bash scripts, but not so many since I started using python. Only exception is for low level functions on systems without a functioning python. -- https://mail.python.org/mailman/listinfo/python-list
