Python and Node js communication

manpreet Best Answer 2 years ago

I have been trying to communicate between Node JS and Python following this tutorial: http://www.sohamkamani.com/blog/2015/08/21/python-nodejs-comm/

The python file reads a javascript array and prints the sum using the numpy module. Here is the code for both the python and node js file.

Python code:

    import sys, json, numpy as np

    #Read data from stdin
    def read_in():
      lines = sys.stdin.readlines()
      return json.loads(lines[0])

    def main():
      #get our data as an array from read_in()
      lines = read_in()

      #create a numpy array
      np_lines = np.array(lines)

      #use numpys sum method to find sum of all elements in the array
      lines_sum = np.sum(np_lines)

      #return the sum to the output stream
      print lines_sum

    #start process
    if __name__ == '__main__':
         main()

Node js code:

    var spawn = require('child_process').spawn,
      py =spawn('python', ['compute_input.py']),
      data = [1,2,3,4,5,6], 
      dataString='';

    py.stdout.on('data', function(data) {
      dataString += data.toString();
    });

    py.stdout.on('end', function() {
      console.log('Sum = ', dataString);
    });

    py.stdin.write(JSON.stringify(data));
    py.stdin.end();

Error message:

    Error: write EPIPE
      at exports._errnoException (util.js:1018:11)
      at Socket._writeGeneric (net.js:711:26)
      at Socket._write (net.js:730:8)
      at doWrite (_stream_writable.js:331:12)
      at writeOrBuffer (_stream_writable.js:317:
                                                

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