On Tuesday, April 4, 2017 at 5:42:23 PM UTC+2, justin walters wrote: > On Tue, Apr 4, 2017 at 8:01 AM, <venkatachalam...@gmail.com> 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 & > > > > 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 > > -- > > https://mail.python.org/mailman/listinfo/python-list > > > > I'm not sure why you need the data in a bash script. What can you do with a > bash script that you > can't do with Python? > > That said, it seems to me that you need a data persistence layer, i.e. a > way to store the dictionary > after it is created. My best advice would be to use the json module to > write out to json files. I > believe this is the best approach because json has a near 1-to-1 mapping > with Python > dictionaries. > > Json is also a good choice because almost every language has a json parser > as part of it's standard > library, making you data extremely portable.
Hi, Thanks for the answer. I need bash for connecting data exchange between two python scripts. To be more specific, data from one script has to be passed to the another script. You are right, I don't need the data in the bash other than to pass the obtained data to the another script which uses the data for further analysis. Regarding using the json file, I am new to this. A naive question is that if the data is too large then is json file is easy to handle? Is json file for large data is not computationally expensive? I am not using textfile for the same reason of being computationally expensive. Thanks, Venkatachalam Srinivasan -- https://mail.python.org/mailman/listinfo/python-list
