caller.ru

# simple ruby code example for running python script

path_to_script = File.dirname(__FILE__)

puts "It's a ruby script"

puts "Run python script with backticks"
puts "Result is available in caller.ru"
puts `python #{path_to_script}/processing.py UserName 37`

puts "Run python script with IO\#popen"
puts "Result is available in caller.ru"
IO.popen("python #{path_to_script}/processing.py UserName 37") { |f| puts f.gets }
# or
@result = IO.popen("python #{path_to_script}/processing.py UserName 37")
puts @result.gets

descrpition

There are few ways to run python scripts from ruby code.

Backticks (`)
Backticks (also called “backquotes”) runs the command in a subshell and returns the standard output from that command.

IO#popen
IO#popen is another way to run a command in a subprocess. popen gives you a bit more control in that the subprocess standard input and standard output are both connected to the IO object.

For example were created caller.ru and processing.py placed in same direcory

processing.py

# called python script

import sys, json

user=sys.argv[1]
score=sys.argv[2]

# processing

# return processing result
print json.dumps({'user':user, 'score':score})

result

user@pc:~/$ ruby caller.ru
It's a ruby script
Run python script with backticks
Result is available in caller.ru
{"user": "UserName", "result": "37"}
Run python script with IO#popen
Result is available in caller.ru
{"user": "UserName", "result": "37"}
{"user": "UserName", "result": "37"}