Remove Python 2-compatibility code

Tests/test_file_png.py

@@ -448,9 +448,7 @@ class TestFilePng(PillowTestCase):
         self.assertIsInstance(im.info["Text"], str)
 
     def test_unicode_text(self):
-        # Check preservation of non-ASCII characters on Python 3
-        # This cannot really be meaningfully tested on Python 2,
-        # since it didn't preserve charsets to begin with.
+        # Check preservation of non-ASCII characters
 
         def rt_text(value):
             im = Image.new("RGB", (32, 32))

Tests/test_imagefont.py

@@ -463,10 +463,7 @@ class TestImageFont(PillowTestCase):
         with self.assertRaises(UnicodeEncodeError):
             font.getsize("’")
 
-    @unittest.skipIf(
-        sys.version.startswith("2") or hasattr(sys, "pypy_translation_info"),
-        "requires CPython 3.3+",
-    )
+    @unittest.skipIf(hasattr(sys, "pypy_translation_info"), "requires CPython")
     def test_unicode_extended(self):
         # issue #3777
         text = "A\u278A\U0001F12B"

src/PIL/ImageQt.py

@@ -65,11 +65,7 @@ def fromqimage(im):
         im.save(buffer, "ppm")
 
     b = BytesIO()
-    try:
-        b.write(buffer.data())
-    except TypeError:
-        # workaround for Python 2
-        b.write(str(buffer.data()))
+    b.write(buffer.data())
     buffer.close()
     b.seek(0)
 

src/PIL/PdfParser.py

@@ -7,11 +7,6 @@ import re
 import time
 import zlib
 
-try:
-    from UserDict import UserDict  # Python 2.x
-except ImportError:
-    UserDict = collections.UserDict  # Python 3.x
-
 
 def make_bytes(s):
     return s.encode("us-ascii")
@@ -256,13 +251,10 @@ class PdfArray(list):
     __str__ = __bytes__
 
 
-class PdfDict(UserDict):
+class PdfDict(collections.UserDict):
     def __setattr__(self, key, value):
         if key == "data":
-            if hasattr(UserDict, "__setattr__"):
-                UserDict.__setattr__(self, key, value)
-            else:
-                self.__dict__[key] = value
+            collections.UserDict.__setattr__(self, key, value)
         else:
             self[key.encode("us-ascii")] = value
 

src/PIL/TiffImagePlugin.py

@@ -1027,7 +1027,7 @@ class TiffImageFile(ImageFile.ImageFile):
                     "Seeking to frame %s, on frame %s, __next %s, location: %s"
                     % (frame, self.__frame, self.__next, self.fp.tell())
                 )
-            # reset python3 buffered io handle in case fp
+            # reset buffered io handle in case fp
             # was passed to libtiff, invalidating the buffer
             self.fp.tell()
             self.fp.seek(self.__next)