diff --git a/cytoolz/__init__.py b/cytoolz/__init__.py
index 01746e9..81f34a3 100644
--- a/cytoolz/__init__.py
+++ b/cytoolz/__init__.py
@@ -8,8 +8,6 @@
 
 from .compatibility import map, filter
 
-# from . import sandbox
-
 from functools import partial, reduce
 
 sorted = sorted
@@ -21,6 +19,8 @@
 flip = functoolz.flip = curry(functoolz.flip)
 memoize = functoolz.memoize = curry(functoolz.memoize)
 
+from . import curried  # sandbox
+
 functoolz._sigs.update_signature_registry()
 
 from ._version import __version__, __toolz_version__
diff --git a/cytoolz/itertoolz.pyx b/cytoolz/itertoolz.pyx
index bd3960a..29193b4 100644
--- a/cytoolz/itertoolz.pyx
+++ b/cytoolz/itertoolz.pyx
@@ -964,8 +964,7 @@ cdef class sliding_window:
         cdef Py_ssize_t i
         self.iterseq = iter(seq)
         self.prev = PyTuple_New(n)
-        for i in range(1, n):
-            seq = next(self.iterseq)
+        for i, seq in enumerate(islice(self.iterseq, n-1), 1):
             Py_INCREF(seq)
             PyTuple_SET_ITEM(self.prev, i, seq)
         self.n = n
@@ -977,14 +976,15 @@ cdef class sliding_window:
         cdef tuple current
         cdef object item
         cdef Py_ssize_t i
+
+        item = next(self.iterseq)
         current = PyTuple_New(self.n)
+        Py_INCREF(item)
+        PyTuple_SET_ITEM(current, self.n-1, item)
         for i in range(1, self.n):
             item = self.prev[i]
             Py_INCREF(item)
             PyTuple_SET_ITEM(current, i-1, item)
-        item = next(self.iterseq)
-        Py_INCREF(item)
-        PyTuple_SET_ITEM(current, self.n-1, item)
         self.prev = current
         return current
 
diff --git a/cytoolz/tests/test_inspect_args.py b/cytoolz/tests/test_inspect_args.py
index bbe68cb..d39278e 100644
--- a/cytoolz/tests/test_inspect_args.py
+++ b/cytoolz/tests/test_inspect_args.py
@@ -402,7 +402,6 @@ def add_blacklist(mod, attr):
             blacklist.add(getattr(mod, attr))
 
     add_blacklist(builtins, 'basestring')
-    add_blacklist(builtins, 'breakpoint')
     add_blacklist(builtins, 'NoneType')
     add_blacklist(builtins, '__metaclass__')
     add_blacklist(builtins, 'sequenceiterator')
diff --git a/cytoolz/tests/test_itertoolz.py b/cytoolz/tests/test_itertoolz.py
index 649e879..86c4370 100644
--- a/cytoolz/tests/test_itertoolz.py
+++ b/cytoolz/tests/test_itertoolz.py
@@ -304,6 +304,7 @@ def test_sliding_window():
 
 def test_sliding_window_of_short_iterator():
     assert list(sliding_window(3, [1, 2])) == []
+    assert list(sliding_window(7, [1, 2])) == []
 
 
 def test_partition():