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 &

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) &

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.

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.

Can someone help me to understand why the code is not working? I tried other 
approaches of function call such as


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
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