Circular imports in Python & Ruby

circular_imports.txt

./ruby/a.rb
require_relative 'b'

class B; end

class A
  @b = B.new
end

./ruby/main.rb
require_relative 'a'
require_relative 'b'

puts A.new.object_id
puts B.new.object_id

./ruby/b.rb
require_relative 'a'

class A; end

class B
  @a = A.new
end

###

./python/main.py
from a import A
from b import B


print id(A())
print id(B())

./python/a.py
from b import B


class A:
    b = B()

./python/b.py
from a import A


class B:
    a = A()