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Piping between Python and Ruby

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1

I am writing a code which can send data between a Python and a Ruby script using a "pipeline" but can not get it to work. Any recommendations or alternative ways?

I have written simple scripts to get it working and build upon them. The objective is to integrate the "pipeline" functionality in a project. In the project, the Python script is to send a .txt file to the Ruby script, which will extract parameter values and store them in respective arrays. I then want to send the arrays back to the Python script.

The simple scripts i have made so far are inspired by https://www.decalage.info/python/ruby_bridge. When running, it continues without stopping and does not produce any results. The goal is to send the integer 6 to the Ruby script where 5 is added, and send the sum back to the Python script. When aborting with ctrl + c, the following is written:

File "./com_ruby.py", line 33, in <module>
 sss = slave.stdout.readline().rstrip()

My Python script:

from subprocess import Popen, PIPE, STDOUT

print('launching slave process...')
slave = Popen(['ruby', 'provar.rb'], stdin=PIPE, stdout=PIPE, stderr=STDOUT)

while True:

 num = bytes([6])
 slave.stdin.write(num)
 # result will be a list of lines:
 result = []
 # read slave output line by line, until we reach "[end]"
 while True:
 # check if slave has terminated:
 if slave.poll() is not None:
 print('slave has terminated.')
 exit()
 # read one line, remove newline chars and trailing spaces:
 sss = slave.stdout.readline().rstrip()
 print('line: ', sss)
 if sss == '[end]':
 break
 result.append(sss)
 print('result:')
 print('n'.join(result))

My Ruby script:

while cmd = STDIN.gets

 cmd.chop!

 cmd = cmd + 5

 cmd.to_s
 print eval(cmd),"n"
 # append [end] so that master knows it's the last line:
 print "[end]n"
 # flush stdout to avoid buffering issues:
 STDOUT.flush

end

Is there any better yet simple way to do the "piping" of data between the two scripts?

python ruby python-3.x pipe

share|improve this question

asked Mar 27 at 12:34

putin putoutputin putout

611 bronze badge

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you considered simply using a predictable file path to store data, and have python and ruby both read from and write to the same data file?
  
  – dreftymac
  Apr 2 at 20:25
  

  
  
  
  

add a comment | 

1

I am writing a code which can send data between a Python and a Ruby script using a "pipeline" but can not get it to work. Any recommendations or alternative ways?

I have written simple scripts to get it working and build upon them. The objective is to integrate the "pipeline" functionality in a project. In the project, the Python script is to send a .txt file to the Ruby script, which will extract parameter values and store them in respective arrays. I then want to send the arrays back to the Python script.

The simple scripts i have made so far are inspired by https://www.decalage.info/python/ruby_bridge. When running, it continues without stopping and does not produce any results. The goal is to send the integer 6 to the Ruby script where 5 is added, and send the sum back to the Python script. When aborting with ctrl + c, the following is written:

File "./com_ruby.py", line 33, in <module>
 sss = slave.stdout.readline().rstrip()

My Python script:

from subprocess import Popen, PIPE, STDOUT

print('launching slave process...')
slave = Popen(['ruby', 'provar.rb'], stdin=PIPE, stdout=PIPE, stderr=STDOUT)

while True:

 num = bytes([6])
 slave.stdin.write(num)
 # result will be a list of lines:
 result = []
 # read slave output line by line, until we reach "[end]"
 while True:
 # check if slave has terminated:
 if slave.poll() is not None:
 print('slave has terminated.')
 exit()
 # read one line, remove newline chars and trailing spaces:
 sss = slave.stdout.readline().rstrip()
 print('line: ', sss)
 if sss == '[end]':
 break
 result.append(sss)
 print('result:')
 print('n'.join(result))

My Ruby script:

while cmd = STDIN.gets

 cmd.chop!

 cmd = cmd + 5

 cmd.to_s
 print eval(cmd),"n"
 # append [end] so that master knows it's the last line:
 print "[end]n"
 # flush stdout to avoid buffering issues:
 STDOUT.flush

end

Is there any better yet simple way to do the "piping" of data between the two scripts?

python ruby python-3.x pipe

share|improve this question

asked Mar 27 at 12:34

putin putoutputin putout

611 bronze badge

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Have you considered simply using a predictable file path to store data, and have python and ruby both read from and write to the same data file?
  
  – dreftymac
  Apr 2 at 20:25
  

  
  
  
  

add a comment | 

I am writing a code which can send data between a Python and a Ruby script using a "pipeline" but can not get it to work. Any recommendations or alternative ways?

I have written simple scripts to get it working and build upon them. The objective is to integrate the "pipeline" functionality in a project. In the project, the Python script is to send a .txt file to the Ruby script, which will extract parameter values and store them in respective arrays. I then want to send the arrays back to the Python script.

The simple scripts i have made so far are inspired by https://www.decalage.info/python/ruby_bridge. When running, it continues without stopping and does not produce any results. The goal is to send the integer 6 to the Ruby script where 5 is added, and send the sum back to the Python script. When aborting with ctrl + c, the following is written:

File "./com_ruby.py", line 33, in <module>
 sss = slave.stdout.readline().rstrip()

My Python script:

from subprocess import Popen, PIPE, STDOUT

print('launching slave process...')
slave = Popen(['ruby', 'provar.rb'], stdin=PIPE, stdout=PIPE, stderr=STDOUT)

while True:

 num = bytes([6])
 slave.stdin.write(num)
 # result will be a list of lines:
 result = []
 # read slave output line by line, until we reach "[end]"
 while True:
 # check if slave has terminated:
 if slave.poll() is not None:
 print('slave has terminated.')
 exit()
 # read one line, remove newline chars and trailing spaces:
 sss = slave.stdout.readline().rstrip()
 print('line: ', sss)
 if sss == '[end]':
 break
 result.append(sss)
 print('result:')
 print('n'.join(result))

My Ruby script:

while cmd = STDIN.gets

 cmd.chop!

 cmd = cmd + 5

 cmd.to_s
 print eval(cmd),"n"
 # append [end] so that master knows it's the last line:
 print "[end]n"
 # flush stdout to avoid buffering issues:
 STDOUT.flush

end

Is there any better yet simple way to do the "piping" of data between the two scripts?

python ruby python-3.x pipe

share|improve this question

asked Mar 27 at 12:34

putin putoutputin putout

611 bronze badge

File "./com_ruby.py", line 33, in <module>
 sss = slave.stdout.readline().rstrip()

from subprocess import Popen, PIPE, STDOUT

print('launching slave process...')
slave = Popen(['ruby', 'provar.rb'], stdin=PIPE, stdout=PIPE, stderr=STDOUT)

while True:

 num = bytes([6])
 slave.stdin.write(num)
 # result will be a list of lines:
 result = []
 # read slave output line by line, until we reach "[end]"
 while True:
 # check if slave has terminated:
 if slave.poll() is not None:
 print('slave has terminated.')
 exit()
 # read one line, remove newline chars and trailing spaces:
 sss = slave.stdout.readline().rstrip()
 print('line: ', sss)
 if sss == '[end]':
 break
 result.append(sss)
 print('result:')
 print('n'.join(result))

while cmd = STDIN.gets

 cmd.chop!

 cmd = cmd + 5

 cmd.to_s
 print eval(cmd),"n"
 # append [end] so that master knows it's the last line:
 print "[end]n"
 # flush stdout to avoid buffering issues:
 STDOUT.flush

end

share|improve this question

asked Mar 27 at 12:34

putin putoutputin putout

611 bronze badge

share|improve this question

asked Mar 27 at 12:34

putin putoutputin putout

611 bronze badge

asked Mar 27 at 12:34

putin putoutputin putout

611 bronze badge

asked Mar 27 at 12:34

putin putoutputin putout

611 bronze badge