Avoid deprecated 'U' mode when opening files

Instead, use PSFile() wrapper to handle all newline in the EPS spec.

Update line ending tests to handle all combinations of '\n' and '\r'.

Fixes warning "DeprecationWarning: 'U' mode is deprecated" in tests.

Tests/test_file_eps.py

@@ -1,7 +1,6 @@
 from helper import unittest, PillowTestCase, hopper
 
 from PIL import Image, EpsImagePlugin
-from PIL._util import py3
 import io
 
 # Our two EPS test files (they are identical except for their bounding boxes)
@@ -196,41 +195,15 @@ def _test_readline(self, t, ending):
         self.assertEqual(t.readline().strip('\r\n'), 'baz', ending)
         self.assertEqual(t.readline().strip('\r\n'), 'bif', ending)
 
-    def _test_readline_stringio(self, test_string, ending):
-        # check all the freaking line endings possible
-        try:
-            import StringIO
-        except ImportError:
-            # don't skip, it skips everything in the parent test
-            return
-        t = StringIO.StringIO(test_string)
+    def _test_readline_io_psfile(self, test_string, ending):
+        f = io.BytesIO(test_string.encode('latin-1'))
+        t = EpsImagePlugin.PSFile(f)
         self._test_readline(t, ending)
 
-    def _test_readline_io(self, test_string, ending):
-        if py3:
-            t = io.StringIO(test_string)
-        else:
-            t = io.StringIO(unicode(test_string))
-        self._test_readline(t, ending)
-
-    def _test_readline_file_universal(self, test_string, ending):
-        f = self.tempfile('temp.txt')
-        with open(f, 'wb') as w:
-            if py3:
-                w.write(test_string.encode('UTF-8'))
-            else:
-                w.write(test_string)
-
-        with open(f, 'rU') as t:
-            self._test_readline(t, ending)
-
     def _test_readline_file_psfile(self, test_string, ending):
         f = self.tempfile('temp.txt')
         with open(f, 'wb') as w:
-            if py3:
-                w.write(test_string.encode('UTF-8'))
-            else:
-                w.write(test_string)
+            w.write(test_string.encode('latin-1'))
 
         with open(f, 'rb') as r:
             t = EpsImagePlugin.PSFile(r)
@@ -239,29 +212,12 @@ def _test_readline_file_psfile(self, test_string, ending):
     def test_readline(self):
         # check all the freaking line endings possible from the spec
         # test_string = u'something\r\nelse\n\rbaz\rbif\n'
-        line_endings = ['\r\n', '\n']
-        not_working_endings = ['\n\r', '\r']
+        line_endings = ['\r\n', '\n', '\n\r', '\r']
         strings = ['something', 'else', 'baz', 'bif']
 
         for ending in line_endings:
             s = ending.join(strings)
-            # Native Python versions will pass these endings.
-            # self._test_readline_stringio(s, ending)
-            # self._test_readline_io(s, ending)
-            # self._test_readline_file_universal(s, ending)
-
-            self._test_readline_file_psfile(s, ending)
-
-        for ending in not_working_endings:
-            # these only work with the PSFile, while they're in spec,
-            # they're not likely to be used
-            s = ending.join(strings)
-
-            # Native Python versions may fail on these endings.
-            # self._test_readline_stringio(s, ending)
-            # self._test_readline_io(s, ending)
-            # self._test_readline_file_universal(s, ending)
-
+            self._test_readline_io_psfile(s, ending)
             self._test_readline_file_psfile(s, ending)
 
     def test_open_eps(self):

src/PIL/EpsImagePlugin.py

@@ -26,7 +26,6 @@
 import sys
 from . import Image, ImageFile
 from ._binary import i32le as i32
-from ._util import py3
 
 __version__ = "0.5"
 
@@ -206,16 +205,7 @@ def _open(self):
 
         # Rewrap the open file pointer in something that will
         # convert line endings and decode to latin-1.
-        try:
-            if py3:
-                # Python3, can use bare open command.
-                fp = open(self.fp.name, "Ur", encoding='latin-1')
-            else:
-                # Python2, no encoding conversion necessary
-                fp = open(self.fp.name, "Ur")
-        except:
-            # Expect this for bytesio/stringio
-            fp = PSFile(self.fp)
+        fp = PSFile(self.fp)
 
         # go to offset - start of "%!PS"
         fp.seek(offset)