PyCallThread

PyCallThread provides PyCallThread.run(&block), which lets you safely run a block of pycall.rb code: even if you're in a thread.

This makes PyCall easier to use from Ruby on Rails, Puma and other threaded web servers.

require 'pycall_thread'

# Initialization is optional but gives you a few config settings
PyCallThread.init do
  # If you need to do anything to setup you venv, you can do it here
  require 'pycall'
end

# We can safely call PyCall, even from a thread (or web request) using `PyCallThread.run`:
Thread.new do
  data_table = PyCallThread.run do
    pandas = PyCall.import('pandas')
    data = pandas.read_csv('https://archive.ics.uci.edu/ml/machine-learning-databases/wine-quality/winequality-red.csv', sep: ';')
    data.head().to_string()
  end
  puts "Data is:"
  puts data_table
end

Examples of using PyCall with webservers:

• Puma
• Ruby on Rails: todo

Gemfile:

gem 'pycall_thread'

After checking out the repo, run bin/setup to install dependencies. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

TODO: make run rake test run the tests