Drop python2 support (#519)

The PR removes python2 references and cases.

Close #518

Co-authored-by: Inada Naoki <[email protected]>

README.md

@@ -220,9 +220,9 @@ and `raw=True` options.
 
 ```pycon
 >>> import msgpack
->>> msgpack.unpackb(msgpack.packb([b'spam', u'eggs'], use_bin_type=False), raw=True)
+>>> msgpack.unpackb(msgpack.packb([b'spam', 'eggs'], use_bin_type=False), raw=True)
 [b'spam', b'eggs']
->>> msgpack.unpackb(msgpack.packb([b'spam', u'eggs'], use_bin_type=True), raw=False)
+>>> msgpack.unpackb(msgpack.packb([b'spam', 'eggs'], use_bin_type=True), raw=False)
 [b'spam', 'eggs']
 ```
 

docs/conf.py

@@ -40,8 +40,8 @@
 master_doc = "index"
 
 # General information about the project.
-project = u"msgpack"
-copyright = u"Inada Naoki"
+project = "msgpack"
+copyright = "Inada Naoki"
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -181,7 +181,7 @@
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, documentclass [howto/manual]).
 latex_documents = [
-    ("index", "msgpack.tex", u"msgpack Documentation", u"Author", "manual"),
+    ("index", "msgpack.tex", "msgpack Documentation", "Author", "manual"),
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
@@ -209,7 +209,7 @@
 
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
-man_pages = [("index", "msgpack", u"msgpack Documentation", [u"Author"], 1)]
+man_pages = [("index", "msgpack", "msgpack Documentation", ["Author"], 1)]
 
 # If true, show URL addresses after external links.
 # man_show_urls = False
@@ -224,8 +224,8 @@
     (
         "index",
         "msgpack",
-        u"msgpack Documentation",
-        u"Author",
+        "msgpack Documentation",
+        "Author",
         "msgpack",
         "One line description of project.",
         "Miscellaneous",
@@ -245,10 +245,10 @@
 # -- Options for Epub output ---------------------------------------------------
 
 # Bibliographic Dublin Core info.
-epub_title = u"msgpack"
-epub_author = u"Author"
-epub_publisher = u"Author"
-epub_copyright = u"2013, Author"
+epub_title = "msgpack"
+epub_author = "Author"
+epub_publisher = "Author"
+epub_copyright = "2013, Author"
 
 # The language of the text. It defaults to the language option
 # or en if the language is not set.

msgpack/__init__.py

@@ -10,7 +10,7 @@
 __version__ = "1.0.5"
 
 
-if os.environ.get("MSGPACK_PUREPYTHON") or sys.version_info[0] == 2:
+if os.environ.get("MSGPACK_PUREPYTHON"):
     from .fallback import Packer, unpackb, Unpacker
 else:
     try:

msgpack/_packer.pyx

@@ -98,7 +98,6 @@ cdef class Packer(object):
         If set to true, datetime with tzinfo is packed into Timestamp type.
         Note that the tzinfo is stripped in the timestamp.
         You can get UTC datetime with `timestamp=3` option of the Unpacker.
-        (Python 2 is not supported).
 
     :param str unicode_errors:
         The error handler for encoding unicode. (default: 'strict')

msgpack/_unpacker.pyx

@@ -236,7 +236,7 @@ cdef class Unpacker(object):
             0 - Timestamp
             1 - float  (Seconds from the EPOCH)
             2 - int  (Nanoseconds from the EPOCH)
-            3 - datetime.datetime  (UTC).  Python 2 is not supported.
+            3 - datetime.datetime  (UTC).
 
     :param bool strict_map_key:
         If true (default), only str or bytes are accepted for map (dict) keys.

msgpack/ext.py

@@ -5,19 +5,6 @@
 import struct
 
 
-PY2 = sys.version_info[0] == 2
-
-if PY2:
-    int_types = (int, long)
-    _utc = None
-else:
-    int_types = int
-    try:
-        _utc = datetime.timezone.utc
-    except AttributeError:
-        _utc = datetime.timezone(datetime.timedelta(0))
-
-
 class ExtType(namedtuple("ExtType", "code data")):
     """ExtType represents ext type in msgpack."""
 
@@ -55,9 +42,9 @@ def __init__(self, seconds, nanoseconds=0):
 
         Note: Negative times (before the UNIX epoch) are represented as negative seconds + positive ns.
         """
-        if not isinstance(seconds, int_types):
+        if not isinstance(seconds, int):
             raise TypeError("seconds must be an integer")
-        if not isinstance(nanoseconds, int_types):
+        if not isinstance(nanoseconds, int):
             raise TypeError("nanoseconds must be an integer")
         if not (0 <= nanoseconds < 10**9):
             raise ValueError(
@@ -174,20 +161,17 @@ def to_unix_nano(self):
     def to_datetime(self):
         """Get the timestamp as a UTC datetime.
 
-        Python 2 is not supported.
-
         :rtype: datetime.
         """
-        return datetime.datetime.fromtimestamp(0, _utc) + datetime.timedelta(
+        utc = datetime.timezone.utc
+        return datetime.datetime.fromtimestamp(0, utc) + datetime.timedelta(
             seconds=self.to_unix()
         )
 
     @staticmethod
     def from_datetime(dt):
         """Create a Timestamp from datetime with tzinfo.
 
-        Python 2 is not supported.
-
         :rtype: Timestamp
         """
         return Timestamp.from_unix(dt.timestamp())

msgpack/fallback.py

@@ -4,22 +4,6 @@
 import struct
 
 
-PY2 = sys.version_info[0] == 2
-if PY2:
-    int_types = (int, long)
-
-    def dict_iteritems(d):
-        return d.iteritems()
-
-else:
-    int_types = int
-    unicode = str
-    xrange = range
-
-    def dict_iteritems(d):
-        return d.items()
-
-
 if sys.version_info < (3, 5):
     # Ugly hack...
     RecursionError = RuntimeError
@@ -134,15 +118,6 @@ def unpackb(packed, **kwargs):
     return ret
 
 
-if sys.version_info < (2, 7, 6):
-
-    def _unpack_from(f, b, o=0):
-        """Explicit type cast for legacy struct.unpack_from"""
-        return struct.unpack_from(f, bytes(b), o)
-
-else:
-    _unpack_from = struct.unpack_from
-
 _NO_FORMAT_USED = ""
 _MSGPACK_HEADERS = {
     0xC4: (1, _NO_FORMAT_USED, TYPE_BIN),
@@ -202,7 +177,7 @@ class Unpacker(object):
             0 - Timestamp
             1 - float  (Seconds from the EPOCH)
             2 - int  (Nanoseconds from the EPOCH)
-            3 - datetime.datetime  (UTC).  Python 2 is not supported.
+            3 - datetime.datetime  (UTC).
 
     :param bool strict_map_key:
         If true (default), only str or bytes are accepted for map (dict) keys.
@@ -477,7 +452,7 @@ def _read_header(self):
             size, fmt, typ = _MSGPACK_HEADERS[b]
             self._reserve(size)
             if len(fmt) > 0:
-                n = _unpack_from(fmt, self._buffer, self._buff_i)[0]
+                n = struct.unpack_from(fmt, self._buffer, self._buff_i)[0]
             else:
                 n = self._buffer[self._buff_i]
             self._buff_i += size
@@ -487,7 +462,7 @@ def _read_header(self):
         elif 0xC7 <= b <= 0xC9:
             size, fmt, typ = _MSGPACK_HEADERS[b]
             self._reserve(size)
-            L, n = _unpack_from(fmt, self._buffer, self._buff_i)
+            L, n = struct.unpack_from(fmt, self._buffer, self._buff_i)
             self._buff_i += size
             if L > self._max_ext_len:
                 raise ValueError("%s exceeds max_ext_len(%s)" % (L, self._max_ext_len))
@@ -496,7 +471,7 @@ def _read_header(self):
             size, fmt = _MSGPACK_HEADERS[b]
             self._reserve(size)
             if len(fmt) > 0:
-                obj = _unpack_from(fmt, self._buffer, self._buff_i)[0]
+                obj = struct.unpack_from(fmt, self._buffer, self._buff_i)[0]
             else:
                 obj = self._buffer[self._buff_i]
             self._buff_i += size
@@ -507,13 +482,13 @@ def _read_header(self):
                     "%s exceeds max_ext_len(%s)" % (size, self._max_ext_len)
                 )
             self._reserve(size + 1)
-            n, obj = _unpack_from(fmt, self._buffer, self._buff_i)
+            n, obj = struct.unpack_from(fmt, self._buffer, self._buff_i)
             self._buff_i += size + 1
         elif 0xD9 <= b <= 0xDB:
             size, fmt, typ = _MSGPACK_HEADERS[b]
             self._reserve(size)
             if len(fmt) > 0:
-                (n,) = _unpack_from(fmt, self._buffer, self._buff_i)
+                (n,) = struct.unpack_from(fmt, self._buffer, self._buff_i)
             else:
                 n = self._buffer[self._buff_i]
             self._buff_i += size
@@ -523,7 +498,7 @@ def _read_header(self):
         elif 0xDC <= b <= 0xDD:
             size, fmt, typ = _MSGPACK_HEADERS[b]
             self._reserve(size)
-            (n,) = _unpack_from(fmt, self._buffer, self._buff_i)
+            (n,) = struct.unpack_from(fmt, self._buffer, self._buff_i)
             self._buff_i += size
             if n > self._max_array_len:
                 raise ValueError(
@@ -532,7 +507,7 @@ def _read_header(self):
         elif 0xDE <= b <= 0xDF:
             size, fmt, typ = _MSGPACK_HEADERS[b]
             self._reserve(size)
-            (n,) = _unpack_from(fmt, self._buffer, self._buff_i)
+            (n,) = struct.unpack_from(fmt, self._buffer, self._buff_i)
             self._buff_i += size
             if n > self._max_map_len:
                 raise ValueError("%s exceeds max_map_len(%s)" % (n, self._max_map_len))
@@ -554,38 +529,38 @@ def _unpack(self, execute=EX_CONSTRUCT):
         # TODO should we eliminate the recursion?
         if typ == TYPE_ARRAY:
             if execute == EX_SKIP:
-                for i in xrange(n):
+                for i in range(n):
                     # TODO check whether we need to call `list_hook`
                     self._unpack(EX_SKIP)
                 return
             ret = newlist_hint(n)
-            for i in xrange(n):
+            for i in range(n):
                 ret.append(self._unpack(EX_CONSTRUCT))
             if self._list_hook is not None:
                 ret = self._list_hook(ret)
             # TODO is the interaction between `list_hook` and `use_list` ok?
             return ret if self._use_list else tuple(ret)
         if typ == TYPE_MAP:
             if execute == EX_SKIP:
-                for i in xrange(n):
+                for i in range(n):
                     # TODO check whether we need to call hooks
                     self._unpack(EX_SKIP)
                     self._unpack(EX_SKIP)
                 return
             if self._object_pairs_hook is not None:
                 ret = self._object_pairs_hook(
                     (self._unpack(EX_CONSTRUCT), self._unpack(EX_CONSTRUCT))
-                    for _ in xrange(n)
+                    for _ in range(n)
                 )
             else:
                 ret = {}
-                for _ in xrange(n):
+                for _ in range(n):
                     key = self._unpack(EX_CONSTRUCT)
-                    if self._strict_map_key and type(key) not in (unicode, bytes):
+                    if self._strict_map_key and type(key) not in (str, bytes):
                         raise ValueError(
                             "%s is not allowed for map key" % str(type(key))
                         )
-                    if not PY2 and type(key) is str:
+                    if type(key) is str:
                         key = sys.intern(key)
                     ret[key] = self._unpack(EX_CONSTRUCT)
                 if self._object_hook is not None:
@@ -698,7 +673,6 @@ class Packer(object):
         If set to true, datetime with tzinfo is packed into Timestamp type.
         Note that the tzinfo is stripped in the timestamp.
         You can get UTC datetime with `timestamp=3` option of the Unpacker.
-        (Python 2 is not supported).
 
     :param str unicode_errors:
         The error handler for encoding unicode. (default: 'strict')
@@ -743,8 +717,6 @@ def __init__(
         self._autoreset = autoreset
         self._use_bin_type = use_bin_type
         self._buffer = StringIO()
-        if PY2 and datetime:
-            raise ValueError("datetime is not supported in Python 2")
         self._datetime = bool(datetime)
         self._unicode_errors = unicode_errors or "strict"
         if default is not None:
@@ -774,7 +746,7 @@ def _pack(
                 if obj:
                     return self._buffer.write(b"\xc3")
                 return self._buffer.write(b"\xc2")
-            if check(obj, int_types):
+            if check(obj, int):
                 if 0 <= obj < 0x80:
                     return self._buffer.write(struct.pack("B", obj))
                 if -0x20 <= obj < 0:
@@ -806,7 +778,7 @@ def _pack(
                     raise ValueError("%s is too large" % type(obj).__name__)
                 self._pack_bin_header(n)
                 return self._buffer.write(obj)
-            if check(obj, unicode):
+            if check(obj, str):
                 obj = obj.encode("utf-8", self._unicode_errors)
                 n = len(obj)
                 if n >= 2**32:
@@ -855,13 +827,11 @@ def _pack(
             if check(obj, list_types):
                 n = len(obj)
                 self._pack_array_header(n)
-                for i in xrange(n):
+                for i in range(n):
                     self._pack(obj[i], nest_limit - 1)
                 return
             if check(obj, dict):
-                return self._pack_map_pairs(
-                    len(obj), dict_iteritems(obj), nest_limit - 1
-                )
+                return self._pack_map_pairs(len(obj), obj.items(), nest_limit - 1)
 
             if self._datetime and check(obj, _DateTime) and obj.tzinfo is not None:
                 obj = Timestamp.from_datetime(obj)
@@ -1004,7 +974,7 @@ def reset(self):
 
     def getbuffer(self):
         """Return view of internal buffer."""
-        if USING_STRINGBUILDER or PY2:
+        if USING_STRINGBUILDER:
             return memoryview(self.bytes())
         else:
             return self._buffer.getbuffer()

setup.py

@@ -10,7 +10,6 @@
 
 
 PYPY = hasattr(sys, "pypy_version_info")
-PY2 = sys.version_info[0] == 2
 
 
 class NoCython(Exception):
@@ -79,7 +78,7 @@ def __init__(self, *args, **kwargs):
     macros = [("__LITTLE_ENDIAN__", "1")]
 
 ext_modules = []
-if not PYPY and not PY2 and not os.environ.get("MSGPACK_PUREPYTHON"):
+if not PYPY and not os.environ.get("MSGPACK_PUREPYTHON"):
     ext_modules.append(
         Extension(
             "msgpack._cmsgpack",

test/test_buffer.py

@@ -6,7 +6,6 @@
 from msgpack import packb, unpackb
 
 
-@pytest.mark.skipif(sys.version_info[0] == 2, reason="Python 2 is not supported")
 def test_unpack_buffer():
     from array import array
 

test/test_case.py

@@ -134,4 +134,4 @@ def test_match():
 
 
 def test_unicode():
-    assert unpackb(packb(u"foobar"), use_list=1) == u"foobar"
+    assert unpackb(packb("foobar"), use_list=1) == "foobar"