Add unary operators support

lib/pycall/pyobject_wrapper.rb

@@ -13,6 +13,12 @@ def self.extend_object(obj)
     end
 
     OPERATOR_METHOD_NAMES = {
+      # Unary operators
+      :+@ => :__pos__,
+      :-@ => :__neg__,
+      :~  => :__invert__,
+
+      # Binary operators
       :+  => :__add__,
       :-  => :__sub__,
       :*  => :__mul__,

test/pycall/test-operators.rb

@@ -0,0 +1,20 @@
+class PyCallOperatorsTest < Test::Unit::TestCase
+  def setup
+    @simple_class = PyCall.import_module("pycall.simple_class").SimpleClass
+  end
+
+  def test_unary_positive
+    x = @simple_class.new("x")
+    assert_equal "+x", +x
+  end
+
+  def test_unary_negative
+    x = @simple_class.new("x")
+    assert_equal "-x", -x
+  end
+
+  def test_unary_invert
+    x = @simple_class.new("x")
+    assert_equal "~x", ~x
+  end
+end

test/python/pycall/simple_class.py

@@ -9,5 +9,14 @@ def initialize(self, x):
         self.x = x
         return 'initialized'
 
+    def __neg__(self):
+        return "-{}".format(self.x)
+
+    def __pos__(self):
+        return "+{}".format(self.x)
+
+    def __invert__(self):
+        return "~{}".format(self.x)
+
 class SimpleSubClass(SimpleClass):
     pass