move project metadata to pyproject.toml (#555)

also: replace flake8 by ruff.

msgpack/__init__.py

@@ -2,7 +2,6 @@ from .exceptions import *
 from .ext import ExtType, Timestamp
 
 import os
-import sys
 
 
 version = (1, 0, 5)

msgpack/ext.py

@@ -1,6 +1,5 @@
 from collections import namedtuple
 import datetime
-import sys
 import struct
 
 
@@ -20,8 +19,9 @@ class ExtType(namedtuple("ExtType", "code data")):
 class Timestamp:
     """Timestamp represents the Timestamp extension type in msgpack.
 
-    When built with Cython, msgpack uses C methods to pack and unpack `Timestamp`. When using pure-Python
-    msgpack, :func:`to_bytes` and :func:`from_bytes` are used to pack and unpack `Timestamp`.
+    When built with Cython, msgpack uses C methods to pack and unpack `Timestamp`.
+    When using pure-Python msgpack, :func:`to_bytes` and :func:`from_bytes` are used to pack and
+    unpack `Timestamp`.
 
     This class is immutable: Do not override seconds and nanoseconds.
     """
@@ -39,7 +39,7 @@ class Timestamp:
             Number of nanoseconds to add to `seconds` to get fractional time.
             Maximum is 999_999_999.  Default is 0.
 
-        Note: Negative times (before the UNIX epoch) are represented as negative seconds + positive ns.
+        Note: Negative times (before the UNIX epoch) are represented as neg. seconds + pos. ns.
         """
         if not isinstance(seconds, int):
             raise TypeError("seconds must be an integer")

msgpack/fallback.py

@@ -530,7 +530,7 @@ class Unpacker:
                     key = self._unpack(EX_CONSTRUCT)
                     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 type(key) is str:
+                    if isinstance(key, str):
                         key = sys.intern(key)
                     ret[key] = self._unpack(EX_CONSTRUCT)
                 if self._object_hook is not None: