diff --git a/docs/eye.rst b/docs/eye.rst
index 6f4b183..b29b597 100644
--- a/docs/eye.rst
+++ b/docs/eye.rst
@@ -30,6 +30,5 @@ Submodules
    eye.qt
    eye.reutils
    eye.structs
-   eye.three
    eye.utils
 
diff --git a/docs/eye.three.rst b/docs/eye.three.rst
deleted file mode 100644
index f014cbf..0000000
--- a/docs/eye.three.rst
+++ /dev/null
@@ -1,7 +0,0 @@
-eye.three module
-================
-
-.. automodule:: eye.three
-    :members:
-    :undoc-members:
-    :show-inheritance:
diff --git a/eye/app.py b/eye/app.py
index bd0867d..3276e3f 100644
--- a/eye/app.py
+++ b/eye/app.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # this project is licensed under the WTFPLv2, see COPYING.txt for details
 
 import argparse
@@ -12,7 +12,6 @@
 
 qApp = lambda: QApplication.instance()
 
-from .three import execfile
 from .qt import Slot
 from . import pathutils
 from . import connector
@@ -181,6 +180,14 @@ def setupLogging():
 	root.handlers[0].setLevel(logging.WARNING)
 
 
+def execfile(path, globals):
+	"""Exec Python `file` with `globals` as in Python 2"""
+	with open(path) as fd:
+		src = fd.read()
+	code = compile(src, path, 'exec')
+	exec(code, globals)  # pylint: disable=exec-used
+
+
 def main():
 	"""Run eye app"""
 
diff --git a/eye/colorutils.py b/eye/colorutils.py
index 41bd7e0..6c31096 100644
--- a/eye/colorutils.py
+++ b/eye/colorutils.py
@@ -9,7 +9,6 @@
 from PyQt5.QtCore import Qt
 from PyQt5.QtGui import QColor
 
-from .three import bytes, str
 
 __all__ = ('QColorAlpha', 'QColor')
 
diff --git a/eye/connector.py b/eye/connector.py
index 6e9adcc..69e2788 100644
--- a/eye/connector.py
+++ b/eye/connector.py
@@ -56,7 +56,6 @@ def foo(editor_obj, path):
 from PyQt5.QtWidgets import QWidget
 
 from .qt import Signal, Slot
-from .three import bytes, str
 from .utils import exceptionLogging
 from . import BUILDING_DOCS, _addDoc
 
diff --git a/eye/helpers/_lexercolorgroups.py b/eye/helpers/_lexercolorgroups.py
index f28c777..91791af 100644
--- a/eye/helpers/_lexercolorgroups.py
+++ b/eye/helpers/_lexercolorgroups.py
@@ -2,7 +2,6 @@
 
 from PyQt5.Qsci import QsciLexerPython, QsciLexerCPP, QsciLexerBash, QsciLexerCSS
 
-from ..three import range
 
 # TODO case insensitive
 
diff --git a/eye/helpers/actions.py b/eye/helpers/actions.py
index 61a1236..4d55f2c 100644
--- a/eye/helpers/actions.py
+++ b/eye/helpers/actions.py
@@ -39,7 +39,6 @@ def myActionFunc(ed):
 from PyQt5.QtWidgets import QAction
 from PyQt5.Qsci import QsciCommand, QsciScintilla
 
-from ..three import bytes, str
 from ..connector import categoryObjects, CONNECTOR
 from ..qt import Slot
 from .. import BUILDING_DOCS
diff --git a/eye/helpers/confcache.py b/eye/helpers/confcache.py
index b0e1ef9..2588372 100644
--- a/eye/helpers/confcache.py
+++ b/eye/helpers/confcache.py
@@ -5,7 +5,6 @@
 from PyQt5.QtCore import QObject
 
 from ..qt import Slot
-from ..three import str
 from .file_monitor import MonitorWithRename
 
 
diff --git a/eye/helpers/editor_search.py b/eye/helpers/editor_search.py
index 1ef9bc7..0d20b67 100644
--- a/eye/helpers/editor_search.py
+++ b/eye/helpers/editor_search.py
@@ -8,7 +8,6 @@
 from ..connector import registerSignal, CategoryMixin
 from ..widgets.editor import HasWeakEditorMixin, SciModification
 from ..widgets import minibuffer
-from ..three import range
 from ..qt import Signal, Slot
 from .. import structs
 from . import buffers
diff --git a/eye/helpers/file_monitor.py b/eye/helpers/file_monitor.py
index 7ae32f3..9ec9cb6 100644
--- a/eye/helpers/file_monitor.py
+++ b/eye/helpers/file_monitor.py
@@ -9,7 +9,6 @@
 
 from PyQt5.QtCore import QFileSystemWatcher, QSignalMapper, QObject
 
-from ..three import str
 from ..qt import Signal, Slot
 from ..connector import registerSignal, disabled
 
diff --git a/eye/helpers/file_search_plugins/base.py b/eye/helpers/file_search_plugins/base.py
index 21850a4..24442a5 100644
--- a/eye/helpers/file_search_plugins/base.py
+++ b/eye/helpers/file_search_plugins/base.py
@@ -2,7 +2,6 @@
 
 from PyQt5.QtCore import QObject
 
-from ...three import str
 from ...qt import Signal, Slot
 
 
diff --git a/eye/helpers/keys.py b/eye/helpers/keys.py
index 9e053ba..c3340f1 100644
--- a/eye/helpers/keys.py
+++ b/eye/helpers/keys.py
@@ -64,7 +64,6 @@
 from PyQt5.QtCore import Qt
 from PyQt5.QtGui import QKeySequence
 
-from ..three import str
 from .actions import registerActionShortcut
 from ..pathutils import getConfigFilePath
 
diff --git a/eye/helpers/lexercolor.py b/eye/helpers/lexercolor.py
index a6d3344..7d26222 100644
--- a/eye/helpers/lexercolor.py
+++ b/eye/helpers/lexercolor.py
@@ -101,7 +101,6 @@
 from six.moves.configparser import SafeConfigParser
 from logging import getLogger
 
-from ..three import str
 from ..connector import categoryObjects, registerSignal, registerSetup, disabled
 from ..colorutils import QColorAlpha
 from ..lexers import stylesFromLexer
diff --git a/eye/helpers/minimap.py b/eye/helpers/minimap.py
index 8270e3d..d1e10a3 100644
--- a/eye/helpers/minimap.py
+++ b/eye/helpers/minimap.py
@@ -8,7 +8,6 @@
 from ..widgets.editor import Editor, SciModification
 from ..widgets.window import Window
 from ..widgets.helpers import acceptIf
-from ..three import range
 from ..qt import Signal, Slot
 
 
diff --git a/eye/helpers/remote_control.py b/eye/helpers/remote_control.py
index 3826419..bc7a856 100644
--- a/eye/helpers/remote_control.py
+++ b/eye/helpers/remote_control.py
@@ -7,7 +7,6 @@
 from PyQt5.QtCore import QObject, Q_CLASSINFO
 from PyQt5.QtDBus import QDBusConnection, QDBusVariant, QDBusMessage
 
-from ..three import str
 from ..connector import disabled, CategoryMixin
 from ..app import qApp
 from ..qt import Slot
diff --git a/eye/helpers/script_reload.py b/eye/helpers/script_reload.py
index 13cf0d0..7826610 100644
--- a/eye/helpers/script_reload.py
+++ b/eye/helpers/script_reload.py
@@ -17,7 +17,6 @@
 import logging
 import os
 
-from ..three import str
 from ..app import qApp
 from ..connector import deleteCreatedBy
 from ..qt import Slot
diff --git a/eye/helpers/session.py b/eye/helpers/session.py
index cef7c6f..96b134d 100644
--- a/eye/helpers/session.py
+++ b/eye/helpers/session.py
@@ -9,7 +9,6 @@
 import json
 import os
 
-from ..three import range, bytes
 from ..connector import categoryObjects
 from ..pathutils import getConfigFilePath
 from ..widgets.window import Window
diff --git a/eye/helpers/ycm/daemon.py b/eye/helpers/ycm/daemon.py
index 0d2c0fb..29a6d1d 100644
--- a/eye/helpers/ycm/daemon.py
+++ b/eye/helpers/ycm/daemon.py
@@ -20,7 +20,6 @@
 from PyQt5.QtCore import QObject, QTimer, QProcess, QUrl
 from PyQt5.QtNetwork import QNetworkAccessManager, QNetworkRequest
 
-from ...three import str, bytes
 from ...connector import CategoryMixin
 from ...qt import Signal, Slot
 from ...app import qApp
diff --git a/eye/procutils.py b/eye/procutils.py
index e50f908..2a2c6d4 100644
--- a/eye/procutils.py
+++ b/eye/procutils.py
@@ -5,7 +5,6 @@
 
 from PyQt5.QtCore import QProcess
 
-from .three import str, bytes
 from .qt import Signal, Slot
 
 
diff --git a/eye/three.py b/eye/three.py
deleted file mode 100644
index c5e9039..0000000
--- a/eye/three.py
+++ /dev/null
@@ -1,35 +0,0 @@
-# this project is licensed under the WTFPLv2, see COPYING.txt for details
-
-"""Python 2 and Python 3 compatibility
-
-This module exports `bytes`, `str`. In Python 3, they map to the normal `bytes` and `str`, but in
-Python 2, the module exports them as aliases to `str` and `unicode`, respectively.
-
-Through all the EYE documentation, `bytes` and `str` will refer to the Python 3 types. EYE uses
-this module to keep compatibility with both versions of Python. The
-`six <https://pythonhosted.org/six/>`_ third-party module is also used in EYE.
-
-`range` is also exported, mapping to `xrange` on Python 2. A drop-in implementation of `execfile`
-for Python 3 is exported too.
-"""
-
-import sys
-
-# pylint: disable=redefined-builtin
-
-if sys.version_info.major < 3:
-	from __builtin__ import str as bytes, unicode as str
-	from __builtin__ import execfile, xrange as range
-else:
-	from builtins import bytes, str, range
-
-	# cheap but ad-hoc replacement
-	def execfile(path, globals):
-		"""Exec Python `file` with `globals` as in Python 2"""
-		with open(path) as fd:
-			src = fd.read()
-		code = compile(src, path, 'exec')
-		exec(code, globals)  # pylint: disable=exec-used
-
-
-__all__ = ('bytes', 'str', 'execfile', 'range')
diff --git a/eye/widgets/editor.py b/eye/widgets/editor.py
index 1c375b5..8aa03b0 100644
--- a/eye/widgets/editor.py
+++ b/eye/widgets/editor.py
@@ -11,12 +11,11 @@
 Positions in the text of an editor widget can be expressed in multiple ways.
 
 First, the position of a character can be expressed as "line-index", which is the line and column of
-that character, in terms of Unicode codepoints, with the `str` type (`unicode` for Python 2,
-see :doc:`eye.three`).
+that character, in terms of Unicode codepoints, with the `str` type.
 Unless specified otherwise, line and column numbers start at 0 in EYE.
 
-Another way, more low-level, is the byte offset of the byte in the byte text (with type `bytes`, see
-:doc:`eye.three`). The internal byte encoding of the editor is UTF-8, regardless of the encoding of
+Another way, more low-level, is the byte offset of the byte in the byte text (with type `bytes`).
+The internal byte encoding of the editor is UTF-8, regardless of the encoding of
 the underlying disk file, which only intervenes when loading/saving.
 
 Module contents
@@ -38,7 +37,6 @@
 import sip
 import six
 
-from ..three import bytes, str
 from ..connector import disabled, registerEventFilter
 from .helpers import CentralWidgetMixin, acceptIf
 from ..qt import Slot, Signal, override
diff --git a/eye/widgets/eval_console.py b/eye/widgets/eval_console.py
index 5a83412..c413aef 100644
--- a/eye/widgets/eval_console.py
+++ b/eye/widgets/eval_console.py
@@ -16,7 +16,6 @@
 from PyQt5.QtWidgets import QVBoxLayout, QLineEdit, QPlainTextEdit, QWidget, QAction, QCompleter
 from six import StringIO
 
-from ..three import bytes
 from ..app import qApp
 from ..utils import exceptionLogging
 from ..qt import Signal, Slot
diff --git a/eye/widgets/filechooser.py b/eye/widgets/filechooser.py
index 040f4f1..872b8b1 100644
--- a/eye/widgets/filechooser.py
+++ b/eye/widgets/filechooser.py
@@ -8,7 +8,6 @@
 import re
 from time import time
 
-from ..three import str, range
 from ..structs import PropDict
 from ..consts import AbsolutePathRole
 from ..qt import Slot
diff --git a/eye/widgets/locationlist.py b/eye/widgets/locationlist.py
index e491339..0a343d7 100644
--- a/eye/widgets/locationlist.py
+++ b/eye/widgets/locationlist.py
@@ -11,7 +11,6 @@
 from PyQt5.QtGui import QStandardItemModel, QStandardItem
 from PyQt5.QtWidgets import QTreeView
 
-from ..three import str
 from .helpers import WidgetMixin
 from .. import consts
 from ..consts import AbsolutePathRole
diff --git a/eye/widgets/minibuffer.py b/eye/widgets/minibuffer.py
index eb7d77b..7ded57b 100644
--- a/eye/widgets/minibuffer.py
+++ b/eye/widgets/minibuffer.py
@@ -4,7 +4,6 @@
 from PyQt5.QtGui import QKeySequence
 from PyQt5.QtWidgets import QLineEdit, QShortcut
 
-from ..three import str
 from ..app import qApp
 from ..connector import categoryObjects
 from ..qt import Signal, Slot
diff --git a/eye/widgets/search.py b/eye/widgets/search.py
index b0a70f6..32c643f 100644
--- a/eye/widgets/search.py
+++ b/eye/widgets/search.py
@@ -6,7 +6,6 @@
 
 import os
 
-from ..three import str
 from .. import consts
 from .helpers import WidgetMixin
 from ..helpers import file_search, buffers
diff --git a/eye/widgets/tabs.py b/eye/widgets/tabs.py
index da43fe1..4feb8f1 100644
--- a/eye/widgets/tabs.py
+++ b/eye/widgets/tabs.py
@@ -8,7 +8,6 @@
 from PyQt5.QtWidgets import QTabWidget, QTabBar, QStackedWidget, QToolButton, QMenu
 
 from .. import consts
-from ..three import str
 from ..qt import Signal, Slot, override
 from ..connector import CategoryMixin, disabled, registerSetup
 from .droparea import DropAreaMixin, BandMixin
diff --git a/eye/widgets/window.py b/eye/widgets/window.py
index 2cb0a84..f12bc45 100644
--- a/eye/widgets/window.py
+++ b/eye/widgets/window.py
@@ -8,7 +8,6 @@
 from PyQt5.QtWidgets import QMainWindow, QFileDialog, QDockWidget, QWidget
 
 from ..connector import registerSignal, disabled
-from ..three import str
 from ..qt import Signal, Slot
 from .. import consts
 from .helpers import CategoryMixin, acceptIf, parentTabWidget
diff --git a/main.py b/main.py
index 5af463b..e8a3184 100755
--- a/main.py
+++ b/main.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # this project is licensed under the WTFPLv2, see COPYING.txt for details
 
 import sys
diff --git a/setup.cfg b/setup.cfg
index f711353..60fec1d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -19,11 +19,7 @@ classifier =
     License :: Public Domain
     Topic :: Text Editors
     Topic :: Text Editors :: Integrated Development Environments (IDE)
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.2
-    Programming Language :: Python :: 3.3
     Programming Language :: Python :: 3.4
     Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
@@ -31,8 +27,8 @@ classifier =
 
 [options]
 zip_safe = 0
+python_requires = >=3.3
 install_requires =
-    six
     PyQt5
     QScintilla
     pyxdg
diff --git a/setup.py b/setup.py
index c2684c6..86efb12 100755
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # this project is licensed under the WTFPLv2, see COPYING.txt for details
 
 import glob