drop Python 2 support

.coveragerc

@@ -1,12 +1,10 @@
 [run]
 omit = 
     deepdish/tests/*
-    deepdish/six.py
 
 [report]
 omit =
     */python?.?/*
     */site-packages/nose/*
     *__init__*
     deepdish/tests/*
-    deepdish/six.py

deepdish/io/hdf5io.py

@@ -1,5 +1,3 @@
-from __future__ import division, print_function, absolute_import
-
 import numpy as np
 import tables
 import warnings
@@ -18,16 +16,14 @@
 except ImportError:
     _sns = False
 
-from deepdish import six
-
 IO_VERSION = 12
 DEEPDISH_IO_PREFIX = 'DEEPDISH_IO'
 DEEPDISH_IO_VERSION_STR = DEEPDISH_IO_PREFIX + '_VERSION'
 DEEPDISH_IO_UNPACK = DEEPDISH_IO_PREFIX + '_DEEPDISH_IO_UNPACK'
 DEEPDISH_IO_ROOT_IS_SNS = DEEPDISH_IO_PREFIX + '_ROOT_IS_SNS'
 
 # Types that should be saved as pytables attribute
-ATTR_TYPES = (int, float, bool, six.string_types, six.binary_type,
+ATTR_TYPES = (int, float, bool, str, bytes,
               np.int8, np.int16, np.int32, np.int64, np.uint8,
               np.uint16, np.uint32, np.uint64, np.float16, np.float32,
               np.float64, np.bool_, np.complex64, np.complex128)
@@ -79,7 +75,7 @@ def _dict_native_ok(d):
 
     # All keys must be strings
     for k in d:
-        if not isinstance(k, six.string_types):
+        if not isinstance(k, str):
             return False
 
     return True
@@ -208,7 +204,7 @@ def _save_level(handler, group, level, name=None, filters=None, idtable=None):
         new_group = handler.create_group(group, name,
                                          "dict:{}".format(len(level)))
         for k, v in level.items():
-            if isinstance(k, six.string_types):
+            if isinstance(k, str):
                 _save_level(handler, new_group, v, name=k, filters=filters,
                             idtable=idtable)
 
@@ -218,7 +214,7 @@ def _save_level(handler, group, level, name=None, filters=None, idtable=None):
         new_group = handler.create_group(
             group, name, "SimpleNamespace:{}".format(len(level.__dict__)))
         for k, v in level.__dict__.items():
-            if isinstance(k, six.string_types):
+            if isinstance(k, str):
                 _save_level(handler, new_group, v, name=k, filters=filters,
                             idtable=idtable)
 

deepdish/io/ls.py

@@ -1,7 +1,6 @@
 """
 Look inside HDF5 files from the terminal, especially those created by deepdish.
 """
-from __future__ import division, print_function, absolute_import
 from .hdf5io import (DEEPDISH_IO_VERSION_STR, DEEPDISH_IO_PREFIX,
                      DEEPDISH_IO_UNPACK, DEEPDISH_IO_ROOT_IS_SNS,
                      IO_VERSION, _sns, is_pandas_dataframe)
@@ -10,7 +9,7 @@
 import sys
 import os
 import re
-from deepdish import io, six, __version__
+from deepdish import io, __version__
 
 COLORS = dict(
     black='30',
@@ -444,7 +443,7 @@ def __repr__(self):
         return 'ValueNode(type={})'.format(type(self.value))
 
     def info(self, colorize=True, final_level=False):
-        if isinstance(self.value, six.text_type):
+        if isinstance(self.value, str):
             if len(self.value) > 25:
                 s = repr(self.value[:22] + '...')
             else:
@@ -454,7 +453,7 @@ def info(self, colorize=True, final_level=False):
                                type_color='green',
                                extra='({})'.format(len(self.value)),
                                colorize=colorize)
-        elif isinstance(self.value, six.binary_type):
+        elif isinstance(self.value, bytes):
             if len(self.value) > 25:
                 s = repr(self.value[:22] + b'...')
             else: