Calling Python from Ruby
Question:
I have a compiled Python library and API docs that I would like to use from Ruby.
Is it possible to load a Python library, instantiate a class defined in it and call methods on that object from Ruby?
Answers:
This article gives some techniques for running Ruby code from Python which should also be applicable in the reverse direction (such as XML-RPC or pipes) as well as specific techniques for running Python code from Ruby. In particular rubypython or Ruby/Python look like they may do what you want.
Are you on Windows? Could you create a DLL or COM object from your python lib and call it with Ruby’s Win32Api or Win32Ole?
Even you can make this work, you might want to consider if this is the best architectural choice. You could run into all sorts of versioning hell trying to maintain such a beast.
If you really can’t find an equivalent Ruby library (or it’s a big investment in Python you want to leverage,) consider using a queue (like RabbitMQ) to implement a message passing design. Then you can keep your Python bits Python and your Ruby bits Ruby and not try to maintain a Frankenstein build environment.
This little library makes it super easy to do this: https://github.com/steeve/rupy
It sounds like you would want to use something like Apache Thrift which allows either your python or your ruby code to be a server/client and call each other.
http://thrift.apache.org/
You can instantiate your objects in ruby and or in python based on your thrift definition. This is an example from the thrift website.
struct UserProfile {
1: i32 uid,
2: string name,
3: string blurb
}
service UserStorage {
void store(1: UserProfile user),
UserProfile retrieve(1: i32 uid)
}
Basically your ruby or python will be able to call store() and retrieve() and create UserProfile objects etc.
https://github.com/mrkn/pycall.rb
Here is a simple example to call Python’s math.sin function and compare it to the Math.sin in Ruby:
require 'pycall/import'
include PyCall::Import
pyimport :math
math.sin(math.pi / 4) - Math.sin(Math::PI / 4) # => 0.0
Type conversions from Ruby to Python are automatically performed for numeric, boolean, string, arrays, and hashes.
I have a compiled Python library and API docs that I would like to use from Ruby.
Is it possible to load a Python library, instantiate a class defined in it and call methods on that object from Ruby?
This article gives some techniques for running Ruby code from Python which should also be applicable in the reverse direction (such as XML-RPC or pipes) as well as specific techniques for running Python code from Ruby. In particular rubypython or Ruby/Python look like they may do what you want.
Are you on Windows? Could you create a DLL or COM object from your python lib and call it with Ruby’s Win32Api or Win32Ole?
Even you can make this work, you might want to consider if this is the best architectural choice. You could run into all sorts of versioning hell trying to maintain such a beast.
If you really can’t find an equivalent Ruby library (or it’s a big investment in Python you want to leverage,) consider using a queue (like RabbitMQ) to implement a message passing design. Then you can keep your Python bits Python and your Ruby bits Ruby and not try to maintain a Frankenstein build environment.
This little library makes it super easy to do this: https://github.com/steeve/rupy
It sounds like you would want to use something like Apache Thrift which allows either your python or your ruby code to be a server/client and call each other.
http://thrift.apache.org/
You can instantiate your objects in ruby and or in python based on your thrift definition. This is an example from the thrift website.
struct UserProfile {
1: i32 uid,
2: string name,
3: string blurb
}
service UserStorage {
void store(1: UserProfile user),
UserProfile retrieve(1: i32 uid)
}
Basically your ruby or python will be able to call store() and retrieve() and create UserProfile objects etc.
https://github.com/mrkn/pycall.rb
Here is a simple example to call Python’s math.sin function and compare it to the Math.sin in Ruby:
require 'pycall/import'
include PyCall::Import
pyimport :math
math.sin(math.pi / 4) - Math.sin(Math::PI / 4) # => 0.0
Type conversions from Ruby to Python are automatically performed for numeric, boolean, string, arrays, and hashes.