diff --git a/setup_mceditlib.py b/setup_mceditlib.py
index f9d3ddb..45c3ea7 100644
--- a/setup_mceditlib.py
+++ b/setup_mceditlib.py
@@ -10,8 +10,9 @@ import Cython.Compiler.Options
 Cython.Compiler.Options.annotate = True
 
 import numpy
+import sys
 
-with file("version.txt") as f:
+with open("version.txt") as f:
     version = f.read().strip()
 
 install_requires = [
@@ -23,7 +24,9 @@ include_dirs = [numpy.get_include()]
 mceditlib_ext_modules = cythonize([
     "src/mceditlib/nbt.pyx",
     "src/mceditlib/relight/with_cython.pyx"
-])
+],
+    compile_time_env={'IS_PY2': sys.version_info[0] < 3},
+    )
 
 for m in mceditlib_ext_modules:
     m.include_dirs = include_dirs
@@ -48,10 +51,12 @@ setup(name='mceditlib',
       url='https://github.com/mcedit/mcedit2',
       license='MIT License',
       packages=find_packages('src', include=["mceditlib*"]),
+      package_data={'mceditlib': ['blocktypes/*.json', 'anvil/biomes.csv']},
       package_dir={'': 'src'},
       ext_modules=mceditlib_ext_modules,
       include_dirs=include_dirs,
       include_package_data=True,
       zip_safe=False,
       install_requires=install_requires,
+      use_2to3=True,
       )
diff --git a/src/mceditlib/anvil/adapter.py b/src/mceditlib/anvil/adapter.py
index c4cb867..2555ae9 100644
--- a/src/mceditlib/anvil/adapter.py
+++ b/src/mceditlib/anvil/adapter.py
@@ -780,7 +780,7 @@ class AnvilWorldAdapter(object):
         """
         lockfile = self.revisionHistory.rootFolder.getFilePath("session.lock")
         self.lockTime = int(time.time() * 1000)
-        with file(lockfile, "wb") as f:
+        with open(lockfile, "wb") as f:
             f.write(struct.pack(">q", self.lockTime))
             f.flush()
             os.fsync(f.fileno())
@@ -798,7 +798,7 @@ class AnvilWorldAdapter(object):
 
         lockfile = self.revisionHistory.rootFolder.getFilePath("session.lock")
         try:
-            (lock, ) = struct.unpack(">q", file(lockfile, "rb").read())
+            (lock, ) = struct.unpack(">q", open(lockfile, "rb").read())
         except struct.error:
             lock = -1
         if lock != self.lockTime:
diff --git a/src/mceditlib/anvil/worldfolder.py b/src/mceditlib/anvil/worldfolder.py
index 855ef8a..aa425b3 100644
--- a/src/mceditlib/anvil/worldfolder.py
+++ b/src/mceditlib/anvil/worldfolder.py
@@ -63,7 +63,7 @@ class AnvilWorldFolder(object):
         return os.unlink(self.getFilePath(path))
 
     def readFile(self, path):
-        with file(self.getFilePath(path), "rb") as f:
+        with open(self.getFilePath(path), "rb") as f:
             return f.read()
 
     def writeFile(self, path, data):
@@ -71,7 +71,7 @@ class AnvilWorldFolder(object):
         dirpath = os.path.dirname(path)
         if not os.path.exists(dirpath):
             os.makedirs(dirpath)
-        with file(path, "wb") as f:
+        with open(path, "wb") as f:
             f.write(data)
 
     def listFolder(self, path):
diff --git a/src/mceditlib/blocktypes/json_resources.py b/src/mceditlib/blocktypes/json_resources.py
index dce9de8..b3b6578 100644
--- a/src/mceditlib/blocktypes/json_resources.py
+++ b/src/mceditlib/blocktypes/json_resources.py
@@ -23,7 +23,7 @@ def openResource(filename):
             log.exception("pkg_resources not available")
             raise
 
-    return file(path)
+    return open(path)
 
 def getJsonFile(filename):
     if filename in _cachedJsons:
diff --git a/src/mceditlib/findadapter.py b/src/mceditlib/findadapter.py
index d64b32c..37a71ed 100644
--- a/src/mceditlib/findadapter.py
+++ b/src/mceditlib/findadapter.py
@@ -79,7 +79,7 @@ def isLevel(cls, filename):
         return cls.canOpenFile(filename)
 
     if os.path.isfile(filename):
-        with file(filename, "rb") as f:
+        with open(filename, "rb") as f:
             data = f.read()
 
         if hasattr(cls, "_isDataLevel"):
diff --git a/src/mceditlib/java.py b/src/mceditlib/java.py
index 0f2cd27..87a0d86 100644
--- a/src/mceditlib/java.py
+++ b/src/mceditlib/java.py
@@ -87,7 +87,7 @@ class JavaLevel(FakeChunkedLevelAdapter):
             gz = gzip.GzipFile(filename)
             strdata = gz.read()
         except Exception:
-            strdata = file(filename, "rb").read()
+            strdata = open(filename, "rb").read()
 
         data = fromstring(strdata, dtype='uint8')
 
diff --git a/src/mceditlib/minecraft_server.py b/src/mceditlib/minecraft_server.py
index 9f8a785..cdc3a17 100644
--- a/src/mceditlib/minecraft_server.py
+++ b/src/mceditlib/minecraft_server.py
@@ -85,7 +85,7 @@ class ServerJarStorage(object):
             os.makedirs(self.cacheDir)
         readme = os.path.join(self.cacheDir, "README.TXT")
         if not os.path.exists(readme):
-            with file(readme, "w") as f:
+            with open(readme, "w") as f:
                 f.write("""
 About this folder:
 
@@ -163,7 +163,7 @@ this way.
 
     def checksumForVersion(self, v):
         jf = self.jarfileForVersion(v)
-        with file(jf, "rb") as f:
+        with open(jf, "rb") as f:
             import hashlib
             return hashlib.md5(f.read()).hexdigest()
 
@@ -198,14 +198,14 @@ def readProperties(filename):
     if not os.path.exists(filename):
         return {}
 
-    with file(filename) as f:
+    with open(filename) as f:
         properties = dict((line.split("=", 2) for line in (l.strip() for l in f) if not line.startswith("#")))
 
     return properties
 
 
 def saveProperties(filename, properties):
-    with file(filename, "w") as f:
+    with open(filename, "w") as f:
         for k, v in properties.iteritems():
             f.write("{0}={1}\n".format(k, v))
 
@@ -304,7 +304,7 @@ class MCServerChunkGenerator(object):
         readme = os.path.join(self.worldCacheDir, "README.TXT")
 
         if not os.path.exists(readme):
-            with file(readme, "w") as f:
+            with open(readme, "w") as f:
                 f.write("""
     About this folder:
 
diff --git a/src/mceditlib/nbt.pyx b/src/mceditlib/nbt.pyx
index 976ff25..47d8870 100644
--- a/src/mceditlib/nbt.pyx
+++ b/src/mceditlib/nbt.pyx
@@ -38,25 +38,46 @@ DEF UNICODE_NAMES = True
 # For each NBT file loaded, cache all of the unicode strings used for tag names. Saves some hundred kilobytes per
 # file since tag names often appear multiple times
 
-DEF UNICODE_CACHE = True
+# The value of the IS_PY2 macro is received from the build script
+IF IS_PY2:
+    DEF UNICODE_CACHE = True
+ELSE:
+    # This codepath is currently unsupported in the python3 version
+    DEF UNICODE_CACHE = False
 
 import collections
 import gzip
 import zlib
 
-from cStringIO import StringIO
-from cpython cimport PyTypeObject, PyUnicode_DecodeUTF8, PyList_Append, PyString_FromStringAndSize
+from cpython cimport PyTypeObject, PyUnicode_DecodeUTF8, PyList_Append
+IF IS_PY2:
+    from cStringIO import StringIO
+    from cpython cimport PyString_FromStringAndSize
+    binary_type = str
+    cdef object iteritems(obj):
+        return obj.iteritems()
+ELSE:
+    from io import BytesIO as StringIO
+    binary_type = bytes
+    cdef object iteritems(obj):
+        return obj.items()
+
 import numpy
 
-cdef extern from "cStringIO.h":
-    struct PycStringIO_CAPI:
-        int cwrite(object o, char * buf, Py_ssize_t len)
-        PyTypeObject * OutputType
-cdef extern from "cobject.h":
-    void * PyCObject_Import(char * module_name, char * cobject_name)
+IF IS_PY2:
+    cdef extern from "cStringIO.h":
+        struct PycStringIO_CAPI:
+            int cwrite(object o, char * buf, Py_ssize_t len)
+            PyTypeObject * OutputType
+    cdef extern from "cobject.h":
+        void * PyCObject_Import(char * module_name, char * cobject_name)
 
-cdef PycStringIO_CAPI *PycStringIO = <PycStringIO_CAPI *> PyCObject_Import("cStringIO", "cStringIO_CAPI")
-cdef PyTypeObject * StringO = PycStringIO.OutputType
+    cdef PycStringIO_CAPI *PycStringIO = <PycStringIO_CAPI *> PyCObject_Import("cStringIO", "cStringIO_CAPI")
+    cdef PyTypeObject * StringO = PycStringIO.OutputType
+ELSE:
+    # The equivalent python3 code has not been written, so for now we fall back
+    # on a codepath that might have poor performance.
+    pass
 
 # Tag IDs
 
@@ -131,7 +152,7 @@ cdef class TAG_Value:
 
         def __set__(self, val):
             IF UNICODE_NAMES:
-                if isinstance(val, str):
+                if isinstance(val, binary_type):
                     val = PyUnicode_DecodeUTF8(val, len(val), "strict")
             ELSE:
                 if isinstance(val, unicode):
@@ -327,7 +348,7 @@ cdef class TAG_String(TAG_Value):
             return self._value
 
         def __set__(self, value):
-            if isinstance(value, str):
+            if isinstance(value, binary_type):
                 value = PyUnicode_DecodeUTF8(value, len(value), "strict")
             self._value = value
 
@@ -509,7 +530,7 @@ cdef class _TAG_Compound(TAG_Value):
             return data
 
         if isinstance(filename_or_buf, basestring):
-            f = file(filename_or_buf, "wb")
+            f = open(filename_or_buf, "wb")
             f.write(data)
         else:
             filename_or_buf.write(data)
@@ -545,7 +566,7 @@ def load(filename="", buf=None):
     :rtype: TAG_Compound
     """
     if filename:
-        buf = file(filename, "rb")
+        buf = open(filename, "rb")
 
     if hasattr(buf, "read"):
         buf = buf.read()
@@ -807,7 +828,10 @@ def hexdump(src, length=8):
 
 cdef void cwrite(obj, char *buf, size_t len):
     #print "cwrite %s %s %d" % (map(ord, buf[:min(4, len)]), buf[:min(4, len)].decode('ascii', 'replace'), len)
-    PycStringIO.cwrite(obj, buf, len)
+    IF IS_PY2:
+        PycStringIO.cwrite(obj, buf, len)
+    ELSE:
+        obj.write(buf[:len])
 
 
 cdef void save_tag_id(char tagID, object buf):
@@ -920,7 +944,7 @@ def nested_string(tag, indent_string="  ", indent=0):
     if tag.tagID == _ID_COMPOUND:
         result += 'TAG_Compound({\n'
         indent += 1
-        for key, value in tag.iteritems():
+        for key, value in iteritems(tag):
             result += indent_string * indent + '"%s": %s,\n' % (key, nested_string(value, indent_string, indent))
         indent -= 1
         result += indent_string * indent + '})'
@@ -962,7 +986,7 @@ def walk(tag, path=None):
     if path is None:
         path = []
     if tag.isCompound():
-        for name, subtag in tag.iteritems():
+        for name, subtag in iteritems(tag):
             yield (name, subtag, path)
             for result in walk(subtag, path + [name]):
                 yield result
diff --git a/src/mceditlib/pc/regionfile.py b/src/mceditlib/pc/regionfile.py
index 49570b2..3cad179 100644
--- a/src/mceditlib/pc/regionfile.py
+++ b/src/mceditlib/pc/regionfile.py
@@ -4,7 +4,7 @@
     Reads and writes chunks to *.mcr* (Minecraft Region)
     and *.mca* (Minecraft Anvil Region) files
 """
-from __future__ import absolute_import
+from __future__ import absolute_import, division
 import logging
 import os
 import struct
@@ -49,18 +49,18 @@ class RegionFile(object):
         if not os.path.exists(path):
             if readonly:
                 raise IOError("Region file not found: %r" % path)
-            file(path, "w").close()
+            open(path, "w").close()
             newFile = True
 
         filesize = os.path.getsize(path)
         mode = "rb" if readonly else "rb+"
-        with file(self.path, mode) as f:
+        with open(self.path, mode) as f:
 
             if newFile:
                 filesize = self.SECTOR_BYTES * 2
                 f.truncate(filesize)
-                self.offsets = numpy.zeros(self.SECTOR_BYTES/4, dtype='>u4')
-                self.modTimes = numpy.zeros(self.SECTOR_BYTES/4, dtype='>u4')
+                self.offsets = numpy.zeros(self.SECTOR_BYTES//4, dtype='>u4')
+                self.modTimes = numpy.zeros(self.SECTOR_BYTES//4, dtype='>u4')
             else:
 
                 if not readonly:
@@ -81,7 +81,7 @@ class RegionFile(object):
                 self.offsets = numpy.fromstring(offsetsData, dtype='>u4')
                 self.modTimes = numpy.fromstring(modTimesData, dtype='>u4')
 
-            self.freeSectors = [True] * (filesize / self.SECTOR_BYTES)
+            self.freeSectors = [True] * (filesize // self.SECTOR_BYTES)
             self.freeSectors[0:2] = False, False
 
             if not newFile:
@@ -208,7 +208,7 @@ class RegionFile(object):
         if sectorStart + numSectors > len(self.freeSectors):
             raise ChunkNotPresent((cx, cz))
 
-        with file(self.path, "rb") as f:
+        with open(self.path, "rb") as f:
             f.seek(sectorStart * self.SECTOR_BYTES)
             data = f.read(numSectors * self.SECTOR_BYTES)
         if len(data) < 5:
@@ -251,7 +251,7 @@ class RegionFile(object):
         offset = self._getOffset(cx, cz)
         sectorNumber = offset >> 8
         sectorsAllocated = offset & 0xff
-        sectorsNeeded = (len(data) + self.CHUNK_HEADER_SIZE) / self.SECTOR_BYTES + 1
+        sectorsNeeded = (len(data) + self.CHUNK_HEADER_SIZE) // self.SECTOR_BYTES + 1
         if sectorsNeeded >= 256:
             err = RegionFormatError("Cannot save chunk %s with compressed length %s (exceeds 1 megabyte)" %
                                     ((cx, cz), len(data)))
@@ -301,7 +301,7 @@ class RegionFile(object):
 
                 region_debug("REGION SAVE {0},{1}, growing by {2}b".format(cx, cz, len(data)))
 
-                with file(self.path, "rb+") as f:
+                with open(self.path, "rb+") as f:
                     f.seek(0, 2)
                     filesize = f.tell()
 
@@ -320,7 +320,7 @@ class RegionFile(object):
         self.setTimestamp(cx, cz)
 
     def writeSector(self, sectorNumber, data, format):
-        with file(self.path, "rb+") as f:
+        with open(self.path, "rb+") as f:
             region_debug("REGION: Writing sector {0}".format(sectorNumber))
 
             f.seek(sectorNumber * self.SECTOR_BYTES)
@@ -341,7 +341,7 @@ class RegionFile(object):
         cx &= 0x1f
         cz &= 0x1f
         self.offsets[cx + cz * 32] = offset
-        with file(self.path, "rb+") as f:
+        with open(self.path, "rb+") as f:
             f.seek(0)
             f.write(self.offsets.tostring())
 
@@ -366,8 +366,6 @@ class RegionFile(object):
         cx &= 0x1f
         cz &= 0x1f
         self.modTimes[cx + cz * 32] = timestamp
-        with file(self.path, "rb+") as f:
+        with open(self.path, "rb+") as f:
             f.seek(self.SECTOR_BYTES)
             f.write(self.modTimes.tostring())
-
-
diff --git a/src/mceditlib/pocket.py b/src/mceditlib/pocket.py
index 269afa0..c7700f6 100644
--- a/src/mceditlib/pocket.py
+++ b/src/mceditlib/pocket.py
@@ -30,7 +30,7 @@ class PocketChunksFile(object):
 
     @property
     def file(self):
-        openfile = lambda: file(self.path, "rb+")
+        openfile = lambda: open(self.path, "rb+")
         if PocketChunksFile.holdFileOpen:
             if self._file is None:
                 self._file = openfile()
@@ -47,7 +47,7 @@ class PocketChunksFile(object):
         self.path = path
         self._file = None
         if not os.path.exists(path):
-            file(path, "w").close()
+            open(path, "w").close()
 
         with self.file as f:
 
diff --git a/src/mceditlib/revisionhistory.py b/src/mceditlib/revisionhistory.py
index 18dccac..325fd58 100644
--- a/src/mceditlib/revisionhistory.py
+++ b/src/mceditlib/revisionhistory.py
@@ -656,7 +656,7 @@ class RevisionHistoryNode(object):
         if self.worldFolder.containsChunk(cx, cz, dimName):
             self.worldFolder.deleteChunk(cx, cz, dimName)
         else:
-            with file(self._deadChunksFile(), "w") as f:
+            with open(self._deadChunksFile(), "w") as f:
                 f.write("%d, %d, %s\n" % (cx, cz, dimName))
                 f.close()
             self.deadChunks.add((cx, cz, dimName))
@@ -669,7 +669,7 @@ class RevisionHistoryNode(object):
         """
         if self.invalid:
             raise RuntimeError("Accessing invalid node: %r" % self)
-        with file(self._deadChunksFile()) as f:
+        with open(self._deadChunksFile()) as f:
             lines = f.read().split('\n')
 
         def _coords():
@@ -733,7 +733,7 @@ class RevisionHistoryNode(object):
         if self.worldFolder.containsFile(path):
             self.worldFolder.deleteFile(path)
         else:
-            with file(self._deadFilesFile(), "w") as f:
+            with open(self._deadFilesFile(), "w") as f:
                 f.write("%s\n" % path)
                 f.close()
             self.deadFiles.add(path)
@@ -746,7 +746,7 @@ class RevisionHistoryNode(object):
         """
         if self.invalid:
             raise RuntimeError("Accessing invalid node: %r" % self)
-        with file(self._deadFilesFile()) as f:
+        with open(self._deadFilesFile()) as f:
             return f.read().split('\n')
 
     def readFile(self, path):
diff --git a/src/mceditlib/selection/__init__.py b/src/mceditlib/selection/__init__.py
index 618c3d6..8af8f5e 100644
--- a/src/mceditlib/selection/__init__.py
+++ b/src/mceditlib/selection/__init__.py
@@ -23,12 +23,13 @@ class ISelection(object):
     """
     chunkPositions = NotImplemented
 
-    def __contains__(self, (x, y, z)):
+    def __contains__(self, xyz):
         """
         Return True if the given set of coordinates is within this selection.
 
         :rtype: bool
         """
+        (x, y, z) = xyz
 
     def contains_coords(self, x, y, z):
         """
@@ -544,7 +545,8 @@ class BoundingBox(SelectionBox):
         # return self.__class__(origin, size)
         return BoundingBox(origin, size)
 
-    def __contains__(self, (x, y, z)):
+    def __contains__(self, xyz):
+        (x, y, z) = xyz
         if x < self.minx or x >= self.maxx:
             return False
         if y < self.miny or y >= self.maxy: