diff --git a/example/__pycache__/test_pyflann.cpython-38-pytest-6.1.1.pyc b/example/__pycache__/test_pyflann.cpython-38-pytest-6.1.1.pyc
new file mode 100644
index 0000000..bcc0dc0
Binary files /dev/null and b/example/__pycache__/test_pyflann.cpython-38-pytest-6.1.1.pyc differ
diff --git a/example/test_pyflann.py b/example/test_pyflann.py
index 618473b..3802c2d 100644
--- a/example/test_pyflann.py
+++ b/example/test_pyflann.py
@@ -13,13 +13,13 @@
 flann = FLANN()
 result, dists = flann.nn(
     dataset, testset, 2, algorithm="kmeans", branching=32, iterations=7, checks=16)
-print result
-print dists
+print(result)
+print(dists)
 
 dataset = np.random.rand(10000, 128)
 testset = np.random.rand(1000, 128)
 flann = FLANN()
 result, dists = flann.nn(
     dataset, testset, 5, algorithm="kmeans", branching=32, iterations=7, checks=16)
-print result
-print dists
+print(result)
+print(dists)
diff --git a/pyflann/__init__.py b/pyflann/__init__.py
index f8ecad3..0d94956 100755
--- a/pyflann/__init__.py
+++ b/pyflann/__init__.py
@@ -24,9 +24,9 @@
 #(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 #THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-from index import *
-from io.dataset import load, save
+from .index import *
+from .io.dataset import load, save
 try:
-    from io.hdf5_dataset import load_range
+    from .io.hdf5_dataset import load_range
 except:
     pass
diff --git a/pyflann/__pycache__/__init__.cpython-36.pyc b/pyflann/__pycache__/__init__.cpython-36.pyc
new file mode 100644
index 0000000..7e9cdb8
Binary files /dev/null and b/pyflann/__pycache__/__init__.cpython-36.pyc differ
diff --git a/pyflann/__pycache__/__init__.cpython-38.pyc b/pyflann/__pycache__/__init__.cpython-38.pyc
new file mode 100644
index 0000000..da7c71f
Binary files /dev/null and b/pyflann/__pycache__/__init__.cpython-38.pyc differ
diff --git a/pyflann/__pycache__/exceptions.cpython-36.pyc b/pyflann/__pycache__/exceptions.cpython-36.pyc
new file mode 100644
index 0000000..1e68895
Binary files /dev/null and b/pyflann/__pycache__/exceptions.cpython-36.pyc differ
diff --git a/pyflann/__pycache__/exceptions.cpython-38.pyc b/pyflann/__pycache__/exceptions.cpython-38.pyc
new file mode 100644
index 0000000..83257c2
Binary files /dev/null and b/pyflann/__pycache__/exceptions.cpython-38.pyc differ
diff --git a/pyflann/__pycache__/index.cpython-36.pyc b/pyflann/__pycache__/index.cpython-36.pyc
new file mode 100644
index 0000000..7199daf
Binary files /dev/null and b/pyflann/__pycache__/index.cpython-36.pyc differ
diff --git a/pyflann/__pycache__/index.cpython-38.pyc b/pyflann/__pycache__/index.cpython-38.pyc
new file mode 100644
index 0000000..277adee
Binary files /dev/null and b/pyflann/__pycache__/index.cpython-38.pyc differ
diff --git a/pyflann/bindings/__init__.py b/pyflann/bindings/__init__.py
index 332f8fa..5e3ae2e 100755
--- a/pyflann/bindings/__init__.py
+++ b/pyflann/bindings/__init__.py
@@ -27,4 +27,4 @@
 #from pyflann import *
 #from pyflann_parameters import parameter_list, algorithm_names
 #from pyflann_parameters import centers_init_names, log_level_names
-from flann_ctypes import *
+from .flann_ctypes import *
diff --git a/pyflann/bindings/__pycache__/__init__.cpython-36.pyc b/pyflann/bindings/__pycache__/__init__.cpython-36.pyc
new file mode 100644
index 0000000..5d87e28
Binary files /dev/null and b/pyflann/bindings/__pycache__/__init__.cpython-36.pyc differ
diff --git a/pyflann/bindings/__pycache__/__init__.cpython-38.pyc b/pyflann/bindings/__pycache__/__init__.cpython-38.pyc
new file mode 100644
index 0000000..c01bca5
Binary files /dev/null and b/pyflann/bindings/__pycache__/__init__.cpython-38.pyc differ
diff --git a/pyflann/bindings/__pycache__/flann_ctypes.cpython-36.pyc b/pyflann/bindings/__pycache__/flann_ctypes.cpython-36.pyc
new file mode 100644
index 0000000..0229dc6
Binary files /dev/null and b/pyflann/bindings/__pycache__/flann_ctypes.cpython-36.pyc differ
diff --git a/pyflann/bindings/__pycache__/flann_ctypes.cpython-38.pyc b/pyflann/bindings/__pycache__/flann_ctypes.cpython-38.pyc
new file mode 100644
index 0000000..e65da92
Binary files /dev/null and b/pyflann/bindings/__pycache__/flann_ctypes.cpython-38.pyc differ
diff --git a/pyflann/bindings/flann_ctypes.py b/pyflann/bindings/flann_ctypes.py
index 1c6c2b6..330994e 100755
--- a/pyflann/bindings/flann_ctypes.py
+++ b/pyflann/bindings/flann_ctypes.py
@@ -50,7 +50,7 @@ def __init__(self):
         self.update(self._defaults_)
 
     def update(self, dict):
-        for k, v in dict.iteritems():
+        for k, v in dict.items():
             if k in self.__field_names:
                 setattr(self, k, self.__translate(k, v))
 
@@ -75,7 +75,7 @@ def __translate(self, k, v):
 
     def __translate_back(self, k, v):
         if k in self._translation_:
-            for tk, tv in self._translation_[k].iteritems():
+            for tk, tv in self._translation_[k].items():
                 if tv == v:
                     return tk
         return v
@@ -148,7 +148,7 @@ def load_flann_library():
             try:
                 flannlib = cdll[os.path.join(root_dir, libdir, libname)]
                 return flannlib
-            except Exception, e:
+            except Exception as e:
                 pass
         tmp = os.path.dirname(root_dir)
         if tmp == root_dir:
@@ -198,7 +198,7 @@ class FlannLib:
 
 def define_functions(str):
     for type in type_mappings:
-        exec str % {'C': type[0], 'numpy': type[1]}
+        exec(str % {'C': type[0], 'numpy': type[1]})
 
 flann.build_index = {}
 define_functions(r"""
diff --git a/pyflann/index.py b/pyflann/index.py
index f8209f2..287c29f 100755
--- a/pyflann/index.py
+++ b/pyflann/index.py
@@ -24,8 +24,8 @@
 #(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 #THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-from bindings.flann_ctypes import *
-from io.dataset import *
+from .bindings.flann_ctypes import *
+from .io.dataset import *
 import numpy.random as _rn
 
 
diff --git a/pyflann/io/__init__.py b/pyflann/io/__init__.py
index de9de45..e24c494 100755
--- a/pyflann/io/__init__.py
+++ b/pyflann/io/__init__.py
@@ -24,4 +24,4 @@
 #(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 #THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-from dataset import *
\ No newline at end of file
+from .dataset import *
\ No newline at end of file
diff --git a/pyflann/io/__pycache__/__init__.cpython-36.pyc b/pyflann/io/__pycache__/__init__.cpython-36.pyc
new file mode 100644
index 0000000..eb4b710
Binary files /dev/null and b/pyflann/io/__pycache__/__init__.cpython-36.pyc differ
diff --git a/pyflann/io/__pycache__/__init__.cpython-38.pyc b/pyflann/io/__pycache__/__init__.cpython-38.pyc
new file mode 100644
index 0000000..e458732
Binary files /dev/null and b/pyflann/io/__pycache__/__init__.cpython-38.pyc differ
diff --git a/pyflann/io/__pycache__/binary_dataset.cpython-36.pyc b/pyflann/io/__pycache__/binary_dataset.cpython-36.pyc
new file mode 100644
index 0000000..1045de7
Binary files /dev/null and b/pyflann/io/__pycache__/binary_dataset.cpython-36.pyc differ
diff --git a/pyflann/io/__pycache__/binary_dataset.cpython-38.pyc b/pyflann/io/__pycache__/binary_dataset.cpython-38.pyc
new file mode 100644
index 0000000..f77213d
Binary files /dev/null and b/pyflann/io/__pycache__/binary_dataset.cpython-38.pyc differ
diff --git a/pyflann/io/__pycache__/dat_dataset.cpython-36.pyc b/pyflann/io/__pycache__/dat_dataset.cpython-36.pyc
new file mode 100644
index 0000000..8771178
Binary files /dev/null and b/pyflann/io/__pycache__/dat_dataset.cpython-36.pyc differ
diff --git a/pyflann/io/__pycache__/dat_dataset.cpython-38.pyc b/pyflann/io/__pycache__/dat_dataset.cpython-38.pyc
new file mode 100644
index 0000000..7103da9
Binary files /dev/null and b/pyflann/io/__pycache__/dat_dataset.cpython-38.pyc differ
diff --git a/pyflann/io/__pycache__/dataset.cpython-36.pyc b/pyflann/io/__pycache__/dataset.cpython-36.pyc
new file mode 100644
index 0000000..13539d7
Binary files /dev/null and b/pyflann/io/__pycache__/dataset.cpython-36.pyc differ
diff --git a/pyflann/io/__pycache__/dataset.cpython-38.pyc b/pyflann/io/__pycache__/dataset.cpython-38.pyc
new file mode 100644
index 0000000..156ca8b
Binary files /dev/null and b/pyflann/io/__pycache__/dataset.cpython-38.pyc differ
diff --git a/pyflann/io/__pycache__/hdf5_dataset.cpython-36.pyc b/pyflann/io/__pycache__/hdf5_dataset.cpython-36.pyc
new file mode 100644
index 0000000..cb9b52d
Binary files /dev/null and b/pyflann/io/__pycache__/hdf5_dataset.cpython-36.pyc differ
diff --git a/pyflann/io/__pycache__/hdf5_dataset.cpython-38.pyc b/pyflann/io/__pycache__/hdf5_dataset.cpython-38.pyc
new file mode 100644
index 0000000..7a7f202
Binary files /dev/null and b/pyflann/io/__pycache__/hdf5_dataset.cpython-38.pyc differ
diff --git a/pyflann/io/__pycache__/npy_dataset.cpython-36.pyc b/pyflann/io/__pycache__/npy_dataset.cpython-36.pyc
new file mode 100644
index 0000000..06f76f3
Binary files /dev/null and b/pyflann/io/__pycache__/npy_dataset.cpython-36.pyc differ
diff --git a/pyflann/io/__pycache__/npy_dataset.cpython-38.pyc b/pyflann/io/__pycache__/npy_dataset.cpython-38.pyc
new file mode 100644
index 0000000..a65cd53
Binary files /dev/null and b/pyflann/io/__pycache__/npy_dataset.cpython-38.pyc differ
diff --git a/pyflann/io/dataset.py b/pyflann/io/dataset.py
index 0b95109..00e9418 100755
--- a/pyflann/io/dataset.py
+++ b/pyflann/io/dataset.py
@@ -27,10 +27,10 @@
 from __future__ import with_statement
 
 from pyflann.exceptions import FLANNException
-import binary_dataset
-import dat_dataset
-import npy_dataset
-import hdf5_dataset
+from . import binary_dataset
+from . import dat_dataset
+from . import npy_dataset
+from . import hdf5_dataset
 
 import os.path
 from numpy import float32
@@ -58,5 +58,5 @@ def save(dataset, filename, format = None, **kwargs):
             format = extension[1:]
         handler = dataset_formats[format]
         handler.save(dataset, filename, **kwargs)
-    except Exception,e:
+    except Exception as e:
         raise FLANNException(e)
diff --git a/pyflann/io/hdf5_dataset.py b/pyflann/io/hdf5_dataset.py
index 43a41d8..fca765e 100755
--- a/pyflann/io/hdf5_dataset.py
+++ b/pyflann/io/hdf5_dataset.py
@@ -31,7 +31,7 @@
 have_h5py = True
 try:
     import h5py
-except Exception,e:
+except Exception as e:
     have_h5py = False
 
 if not have_h5py:
@@ -64,7 +64,7 @@ def save(dataset, filename, **kwargs):
             h5file = h5py.File(filename)
             h5file.create_dataset(dataset_name, data=dataset)
             h5file.close()
-        except Exception,e:
+        except Exception as e:
             h5file.close()
             raise FLANNException(e)
 
@@ -82,7 +82,7 @@ def load(filename, rows = -1, cols = -1, dtype = numpy.float32, **kwargs):
                     data = numpy.array(h5file[node])
             h5file.close()
             return data
-        except Exception,e:
+        except Exception as e:
             h5file.close()
             raise FLANNException(e)