Fix period raising exceptions in __eq__()

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Fixed
 
 - Fixed ISO week dates not being parsed properly in `fom_format()`.
+- Fixed period `==` comparison raising an exception when compared with other types.
 
 
 ## [2.0.4] - 2018-10-30

pendulum/period.py

@@ -372,8 +372,11 @@ def __hash__(self):
         return hash((self.start, self.end, self._absolute))
 
     def __eq__(self, other):
-        return (self.start, self.end, self._absolute) == (
-            other.start,
-            other.end,
-            other._absolute,
-        )
+        try:
+            return (self.start, self.end, self._absolute) == (
+                other.start,
+                other.end,
+                other._absolute,
+            )
+        except AttributeError:
+            return NotImplemented

tests/period/test_behavior.py

@@ -40,3 +40,11 @@ def test_comparison_to_timedelta():
     period = dt2 - dt1
 
     assert period < timedelta(days=4)
+
+def test_comparison_with_other():
+    dt1 = pendulum.datetime(2016, 11, 18)
+    dt2 = pendulum.datetime(2016, 11, 20)
+    p = pendulum.period(dt1, dt2)
+
+    assert p != None
+    assert not p == None