Don't allow RedisDeques to equal Python lists... (#574)

* Don't allow RedisDeques to equal Python lists...

...even if they contain the same elements.

```python
>>> import collections
>>> collections.deque([1, 2, 3]) == [1, 2, 3]
False
```

* Bump version number

pottery/__init__.py

@@ -32,7 +32,7 @@
 
 
 __title__: Final[str] = 'pottery'
-__version__: Final[str] = '2.3.3'
+__version__: Final[str] = '2.3.4'
 __description__: Final[str] = __doc__.split(sep='\n\n', maxsplit=1)[0]
 __url__: Final[str] = 'https://github.com/brainix/pottery'
 __author__: Final[str] = 'Rajiv Bakulesh Shah'

pottery/deque.py

@@ -35,7 +35,9 @@
 class RedisDeque(RedisList, collections.deque):  # type: ignore
     'Redis-backed container compatible with collections.deque.'
 
-    # Method overrides:
+    # Overrides:
+
+    _ALLOWED_TO_EQUAL = collections.deque  # type: ignore
 
     def __init__(self,
                  iterable: Iterable[JSONTypes] = tuple(),

pottery/list.py

@@ -60,6 +60,8 @@ def wrapper(*args: Any, **kwargs: Any) -> Any:
 class RedisList(Base, collections.abc.MutableSequence):
     'Redis-backed container compatible with Python lists.'
 
+    _ALLOWED_TO_EQUAL = list
+
     def __slice_to_indices(self, slice_or_index: Union[slice, int]) -> range:
         if isinstance(slice_or_index, slice):
             start, stop, step = cast(slice, slice_or_index).indices(len(self))
@@ -261,13 +263,13 @@ def __eq__(self, other: Any) -> bool:
         if self._same_redis(other) and self.key == other.key:
             return True
 
-        if type(other) not in {list, self.__class__}:
+        if type(other) not in {self.__class__, self._ALLOWED_TO_EQUAL}:
             return False
         with self._watch(other):
             if len(self) != len(other):
                 return False
 
-            # other is a mutable sequence too, and self and other are the same
+            # other is a list or RedisList too, and self and other are the same
             # length.  Make Python lists out of self and other, and compare
             # those lists.
             warnings.warn(

tests/test_deque.py

@@ -16,6 +16,7 @@
 # --------------------------------------------------------------------------- #
 
 
+import collections
 import itertools
 import unittest.mock
 
@@ -31,34 +32,34 @@ class DequeTests(TestCase):
 
     def test_basic_usage(self):
         d = RedisDeque('ghi', redis=self.redis)
-        assert d == ['g', 'h', 'i']
+        assert d == collections.deque(['g', 'h', 'i'])
 
         d.append('j')
         d.appendleft('f')
-        assert d == ['f', 'g', 'h', 'i', 'j']
+        assert d == collections.deque(['f', 'g', 'h', 'i', 'j'])
 
         assert d.pop() == 'j'
         assert d.popleft() == 'f'
-        assert d == ['g', 'h', 'i']
+        assert d == collections.deque(['g', 'h', 'i'])
         assert d[0] == 'g'
         assert d[-1] == 'i'
 
         assert list(reversed(d)) == ['i', 'h', 'g']
         assert 'h' in d
         d.extend('jkl')
-        assert d == ['g', 'h', 'i', 'j', 'k', 'l']
+        assert d == collections.deque(['g', 'h', 'i', 'j', 'k', 'l'])
         d.rotate(1)
-        assert d == ['l', 'g', 'h', 'i', 'j', 'k']
+        assert d == collections.deque(['l', 'g', 'h', 'i', 'j', 'k'])
         d.rotate(-1)
-        assert d == ['g', 'h', 'i', 'j', 'k', 'l']
+        assert d == collections.deque(['g', 'h', 'i', 'j', 'k', 'l'])
 
-        assert RedisDeque(reversed(d), redis=self.redis) == ['l', 'k', 'j', 'i', 'h', 'g']
+        assert RedisDeque(reversed(d), redis=self.redis) == collections.deque(['l', 'k', 'j', 'i', 'h', 'g'])
         d.clear()
         with self.assertRaises(IndexError):
             d.pop()
 
         d.extendleft('abc')
-        assert d == ['c', 'b', 'a']
+        assert d == collections.deque(['c', 'b', 'a'])
 
     def test_init_with_wrong_type_maxlen(self):
         with unittest.mock.patch.object(Base, '__del__') as delete, \
@@ -68,10 +69,10 @@ def test_init_with_wrong_type_maxlen(self):
 
     def test_init_with_maxlen(self):
         d = RedisDeque([1, 2, 3, 4, 5, 6], redis=self.redis, maxlen=3)
-        assert d == [4, 5, 6]
+        assert d == collections.deque([4, 5, 6])
 
         d = RedisDeque([1, 2, 3, 4, 5, 6], redis=self.redis, maxlen=0)
-        assert d == []
+        assert d == collections.deque()
 
     def test_persistent_deque_bigger_than_maxlen(self):
         d1 = RedisDeque('ghi', redis=self.redis)
@@ -87,26 +88,26 @@ def test_maxlen_not_writable(self):
     def test_insert_into_full(self):
         d = RedisDeque('gh', redis=self.redis, maxlen=3)
         d.insert(len(d), 'i')
-        assert d == ['g', 'h', 'i']
+        assert d == collections.deque(['g', 'h', 'i'])
 
         with self.assertRaises(IndexError):
             d.insert(len(d), 'j')
 
     def test_append_trims_when_full(self):
         d = RedisDeque('gh', redis=self.redis, maxlen=3)
         d.append('i')
-        assert d == ['g', 'h', 'i']
+        assert d == collections.deque(['g', 'h', 'i'])
         d.append('j')
-        assert d == ['h', 'i', 'j']
+        assert d == collections.deque(['h', 'i', 'j'])
         d.appendleft('g')
-        assert d == ['g', 'h', 'i']
+        assert d == collections.deque(['g', 'h', 'i'])
 
     def test_extend(self):
         d = RedisDeque('ghi', redis=self.redis, maxlen=4)
         d.extend('jkl')
-        assert d == ['i', 'j', 'k', 'l']
+        assert d == collections.deque(['i', 'j', 'k', 'l'])
         d.extendleft('hg')
-        assert d == ['g', 'h', 'i', 'j']
+        assert d == collections.deque(['g', 'h', 'i', 'j'])
 
     def test_popleft_from_empty(self):
         d = RedisDeque(redis=self.redis)
@@ -124,29 +125,29 @@ def test_rotate_zero_steps(self):
         'Rotating 0 steps is a no-op'
         d = RedisDeque(('g', 'h', 'i', 'j', 'k', 'l'), redis=self.redis)
         d.rotate(0)
-        assert d == ['g', 'h', 'i', 'j', 'k', 'l']
+        assert d == collections.deque(['g', 'h', 'i', 'j', 'k', 'l'])
 
     def test_rotate_empty_deque(self):
         'Rotating an empty RedisDeque is a no-op'
         d = RedisDeque(redis=self.redis)
         d.rotate(2)
-        assert d == []
+        assert d == collections.deque()
 
     def test_rotate_right(self):
         'A positive number rotates a RedisDeque right'
         # I got this example from here:
         #   https://pymotw.com/2/collections/deque.html#rotating
         d = RedisDeque(range(10), redis=self.redis)
         d.rotate(2)
-        assert d == [8, 9, 0, 1, 2, 3, 4, 5, 6, 7]
+        assert d == collections.deque([8, 9, 0, 1, 2, 3, 4, 5, 6, 7])
 
     def test_rotate_left(self):
         'A negative number rotates a RedisDeque left'
         # I got this example from here:
         #   https://pymotw.com/2/collections/deque.html#rotating
         d = RedisDeque(range(10), redis=self.redis)
         d.rotate(-2)
-        assert d == [2, 3, 4, 5, 6, 7, 8, 9, 0, 1]
+        assert d == collections.deque([2, 3, 4, 5, 6, 7, 8, 9, 0, 1])
 
     def test_moving_average(self):
         'Test RedisDeque-based moving average'
@@ -177,7 +178,7 @@ def test_delete_nth(self):
         e = d.popleft()
         d.rotate(3)
         assert e == 'j'
-        assert d == ['g', 'h', 'i', 'k', 'l']
+        assert d == collections.deque(['g', 'h', 'i', 'k', 'l'])
 
     def test_truthiness(self):
         d = RedisDeque('ghi', redis=self.redis)