add method isNil

README.md

@@ -292,7 +292,11 @@ R.isEmpty(Obj()) # False
 R.isEmpty(None) # False
 ```
 
-- [ ] isNil
+- [x] isNil
+
+We keep the same method name as ramda,
+this is for checking if the given value is None or not.
+
 - [x] 0.1.2 join
 - [x] 0.1.4 juxt
 - [x] 0.1.2 keys

ramda/__init__.py

@@ -50,6 +50,7 @@
 from .invoker import invoker
 from .Is import Is
 from .isEmpty import isEmpty
+from .isNil import isNil
 from .join import join
 from .juxt import juxt
 from .keys import keys

ramda/isNil.py

@@ -0,0 +1,3 @@
+from .private._curry1 import _curry1
+
+isNil = _curry1(lambda x: x is None)

test/test_isNil.py

@@ -0,0 +1,21 @@
+
+import unittest
+
+import ramda as R
+
+"""
+https://github.com/ramda/ramda/blob/master/test/isNil.js
+"""
+
+
+class TestIsNil(unittest.TestCase):
+  def test_a_value_for_None(self):
+    self.assertEqual(True, R.isNil(None))
+    self.assertEqual(False, R.isNil([]))
+    self.assertEqual(False, R.isNil({}))
+    self.assertEqual(False, R.isNil(0))
+    self.assertEqual(False, R.isNil(''))
+
+
+if __name__ == '__main__':
+  unittest.main()