Make super() calls Python 2 compatible.

gym/spaces/box.py

@@ -34,7 +34,7 @@ def __init__(self, low=None, high=None, shape=None, dtype=None):
             logger.warn("gym.spaces.Box autodetected dtype as {}. Please provide explicit dtype.".format(dtype))
         self.low = low.astype(dtype)
         self.high = high.astype(dtype)
-        super().__init__(shape, dtype)
+        super(Box, self).__init__(shape, dtype)
         self.np_random = np.random.RandomState()
 
     def seed(self, seed):

gym/spaces/dict_space.py

@@ -41,7 +41,7 @@ def __init__(self, spaces=None, **spaces_kwargs):
         if isinstance(spaces, list):
             spaces = OrderedDict(spaces)
         self.spaces = spaces
-        super().__init__(None, None) # None for shape and dtype, since it'll require special handling
+        super(Dict, self).__init__(None, None) # None for shape and dtype, since it'll require special handling
 
     def seed(self, seed):
         [space.seed(seed) for space in self.spaces.values()]

gym/spaces/discrete.py

@@ -12,7 +12,7 @@ class Discrete(Space):
     """
     def __init__(self, n):
         self.n = n
-        super().__init__((), np.int64)
+        super(Discrete, self).__init__((), np.int64)
         self.np_random = np.random.RandomState()
 
     def seed(self, seed):

gym/spaces/multi_binary.py

@@ -6,7 +6,7 @@
 class MultiBinary(Space):
     def __init__(self, n):
         self.n = n
-        super().__init__((self.n,), np.int8)
+        super(MultiBinary, self).__init__((self.n,), np.int8)
         self.np_random = np.random.RandomState()
 
     def seed(self, seed):

gym/spaces/multi_discrete.py

@@ -11,7 +11,7 @@ def __init__(self, nvec):
         assert (np.array(nvec) > 0).all(), 'nvec (counts) have to be positive'
         self.nvec = np.asarray(nvec, dtype=np.uint32)
 
-        super().__init__(self.nvec.shape, np.uint32)
+        super(MultiDiscrete, self).__init__(self.nvec.shape, np.uint32)
         self.np_random = np.random.RandomState()
 
     def seed(self, seed):

gym/spaces/tuple_space.py

@@ -11,7 +11,7 @@ class Tuple(Space):
     """
     def __init__(self, spaces):
         self.spaces = spaces
-        super().__init__(None, None)
+        super(Tuple, self).__init__(None, None)
 
     def seed(self, seed):
         [space.seed(seed) for space in self.spaces]