diff --git a/Lib/argparse.py b/Lib/argparse.py
index f0cfe27..236e1e8 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -641,7 +641,7 @@
     """
 
     def _fill_text(self, text, width, indent):
-        return ''.join([indent + line for line in text.splitlines(True)])
+        return ''.join(indent + line for line in text.splitlines(keepends=True))
 
 
 class RawTextHelpFormatter(RawDescriptionHelpFormatter):
diff --git a/Lib/codecs.py b/Lib/codecs.py
index b150d64..e63a0c6 100644
--- a/Lib/codecs.py
+++ b/Lib/codecs.py
@@ -484,7 +484,7 @@
                 if firstline:
                     newchars, decodedbytes = \
                         self.decode(data[:exc.start], self.errors)
-                    lines = newchars.splitlines(True)
+                    lines = newchars.splitlines(keepends=True)
                     if len(lines)<=1:
                         raise
                 else:
@@ -526,7 +526,7 @@
                 self.charbuffer = self.linebuffer[0]
                 self.linebuffer = None
             if not keepends:
-                line = line.splitlines(False)[0]
+                line = line.splitlines(keepends=False)[0]
             return line
 
         readsize = size or 72
@@ -543,7 +543,7 @@
                     data += self.read(size=1, chars=1)
 
             line += data
-            lines = line.splitlines(True)
+            lines = line.splitlines(keepends=True)
             if lines:
                 if len(lines) > 1:
                     # More than one line result; the first line is a full line
@@ -559,10 +559,10 @@
                         # only one remaining line, put it back into charbuffer
                         self.charbuffer = lines[0] + self.charbuffer
                     if not keepends:
-                        line = line.splitlines(False)[0]
+                        line = line.splitlines(keepends=False)[0]
                     break
                 line0withend = lines[0]
-                line0withoutend = lines[0].splitlines(False)[0]
+                line0withoutend = lines[0].splitlines(keepends=False)[0]
                 if line0withend != line0withoutend: # We really have a line end
                     # Put the rest back together and keep it until the next call
                     self.charbuffer = self._empty_charbuffer.join(lines[1:]) + \
@@ -575,7 +575,7 @@
             # we didn't get anything or this was our only try
             if not data or size is not None:
                 if line and not keepends:
-                    line = line.splitlines(False)[0]
+                    line = line.splitlines(keepends=False)[0]
                 break
             if readsize < 8000:
                 readsize *= 2
@@ -803,7 +803,7 @@
 
         data = self.reader.read()
         data, bytesencoded = self.encode(data, self.errors)
-        return data.splitlines(1)
+        return data.splitlines(keepends=True)
 
     def __next__(self):
 
diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py
index e5e0277..3e864b6 100644
--- a/Lib/collections/__init__.py
+++ b/Lib/collections/__init__.py
@@ -1045,7 +1045,7 @@
         return self.data.split(sep, maxsplit)
     def rsplit(self, sep=None, maxsplit=-1):
         return self.data.rsplit(sep, maxsplit)
-    def splitlines(self, keepends=0): return self.data.splitlines(keepends)
+    def splitlines(self, keepends=False): return self.data.splitlines(keepends)
     def startswith(self, prefix, start=0, end=_sys.maxsize):
         return self.data.startswith(prefix, start, end)
     def strip(self, chars=None): return self.__class__(self.data.strip(chars))
diff --git a/Lib/difflib.py b/Lib/difflib.py
index e6cc6ee..d34bbca 100644
--- a/Lib/difflib.py
+++ b/Lib/difflib.py
@@ -800,7 +800,7 @@
     ...   2. Explicit is better than implicit.
     ...   3. Simple is better than complex.
     ...   4. Complex is better than complicated.
-    ... '''.splitlines(1)
+    ... '''.splitlines(keepends=True)
     >>> len(text1)
     4
     >>> text1[0][-1]
@@ -809,7 +809,7 @@
     ...   3.   Simple is better than complex.
     ...   4. Complicated is better than complex.
     ...   5. Flat is better than nested.
-    ... '''.splitlines(1)
+    ... '''.splitlines(keepends=True)
 
     Next we instantiate a Differ object:
 
@@ -896,8 +896,8 @@
 
         Example:
 
-        >>> print(''.join(Differ().compare('one\ntwo\nthree\n'.splitlines(1),
-        ...                                'ore\ntree\nemu\n'.splitlines(1))),
+        >>> print(''.join(Differ().compare('one\ntwo\nthree\n'.splitlines(True),
+        ...                                'ore\ntree\nemu\n'.splitlines(True))),
         ...       end="")
         - one
         ?  ^
@@ -1269,8 +1269,8 @@
 
     Example:
 
-    >>> print(''.join(context_diff('one\ntwo\nthree\nfour\n'.splitlines(1),
-    ...       'zero\none\ntree\nfour\n'.splitlines(1), 'Original', 'Current')),
+    >>> print(''.join(context_diff('one\ntwo\nthree\nfour\n'.splitlines(True),
+    ...       'zero\none\ntree\nfour\n'.splitlines(True), 'Original', 'Current')),
     ...       end="")
     *** Original
     --- Current
@@ -1339,8 +1339,8 @@
 
     Example:
 
-    >>> diff = ndiff('one\ntwo\nthree\n'.splitlines(1),
-    ...              'ore\ntree\nemu\n'.splitlines(1))
+    >>> diff = ndiff('one\ntwo\nthree\n'.splitlines(keepends=True),
+    ...              'ore\ntree\nemu\n'.splitlines(keepends=True))
     >>> print(''.join(diff), end="")
     - one
     ?  ^
@@ -2034,8 +2034,8 @@
 
     Examples:
 
-    >>> diff = ndiff('one\ntwo\nthree\n'.splitlines(1),
-    ...              'ore\ntree\nemu\n'.splitlines(1))
+    >>> diff = ndiff('one\ntwo\nthree\n'.splitlines(keepends=True),
+    ...              'ore\ntree\nemu\n'.splitlines(keepends=True))
     >>> diff = list(diff)
     >>> print(''.join(restore(diff, 1)), end="")
     one
diff --git a/Lib/doctest.py b/Lib/doctest.py
index be8cc23..9d1501c 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -1332,7 +1332,7 @@
         m = self.__LINECACHE_FILENAME_RE.match(filename)
         if m and m.group('name') == self.test.name:
             example = self.test.examples[int(m.group('examplenum'))]
-            return example.source.splitlines(True)
+            return example.source.splitlines(keepends=True)
         else:
             return self.save_linecache_getlines(filename, module_globals)
 
@@ -1595,8 +1595,8 @@
         # Check if we should use diff.
         if self._do_a_fancy_diff(want, got, optionflags):
             # Split want & got into lines.
-            want_lines = want.splitlines(True)  # True == keep line ends
-            got_lines = got.splitlines(True)
+            want_lines = want.splitlines(keepends=True)
+            got_lines = got.splitlines(keepends=True)
             # Use difflib to find their differences.
             if optionflags & REPORT_UDIFF:
                 diff = difflib.unified_diff(want_lines, got_lines, n=2)
diff --git a/Lib/lib2to3/refactor.py b/Lib/lib2to3/refactor.py
index ae5e40f..3c06405 100644
--- a/Lib/lib2to3/refactor.py
+++ b/Lib/lib2to3/refactor.py
@@ -560,7 +560,7 @@
         block_lineno = None
         indent = None
         lineno = 0
-        for line in input.splitlines(True):
+        for line in input.splitlines(keepends=True):
             lineno += 1
             if line.lstrip().startswith(self.PS1):
                 if block is not None:
@@ -604,7 +604,7 @@
                            filename, lineno, err.__class__.__name__, err)
             return block
         if self.refactor_tree(tree, filename):
-            new = str(tree).splitlines(True)
+            new = str(tree).splitlines(keepends=True)
             # Undo the adjustment of the line numbers in wrap_toks() below.
             clipped, new = new[:lineno-1], new[lineno-1:]
             assert clipped == ["\n"] * (lineno-1), clipped
diff --git a/Lib/string.py b/Lib/string.py
index d4f9cd9..8bcd1dc 100644
--- a/Lib/string.py
+++ b/Lib/string.py
@@ -84,7 +84,7 @@
 
     def _invalid(self, mo):
         i = mo.start('invalid')
-        lines = self.template[:i].splitlines(True)
+        lines = self.template[:i].splitlines(keepends=True)
         if not lines:
             colno = 1
             lineno = 1
diff --git a/Lib/test/test_calendar.py b/Lib/test/test_calendar.py
index d3093ac..7180afe 100644
--- a/Lib/test/test_calendar.py
+++ b/Lib/test/test_calendar.py
@@ -177,7 +177,7 @@
             return not c.isspace() and not c.isdigit()
 
         lines = []
-        for line in s.splitlines(False):
+        for line in s.splitlines(keepends=False):
             # Drop texts, as they are locale dependent
             if line and not filter(neitherspacenordigit, line):
                 lines.append(line)
diff --git a/Lib/test/test_email/__init__.py b/Lib/test/test_email/__init__.py
index 04fdf89..280afbd 100644
--- a/Lib/test/test_email/__init__.py
+++ b/Lib/test/test_email/__init__.py
@@ -38,7 +38,7 @@
             return email.message_from_file(fp)
 
     def _bytes_repr(self, b):
-        return [repr(x) for x in b.splitlines(True)]
+        return [repr(x) for x in b.splitlines(keepends=True)]
 
     def assertBytesEqual(self, first, second, msg):
         """Our byte strings are really encoded strings; improve diff output"""
diff --git a/Lib/test/test_gzip.py b/Lib/test/test_gzip.py
index 3ea5c41..9c7a96e 100644
--- a/Lib/test/test_gzip.py
+++ b/Lib/test/test_gzip.py
@@ -139,7 +139,7 @@
             with io.BufferedReader(f) as r:
                 lines = [line for line in r]
 
-        self.assertEqual(lines, 50 * data1.splitlines(True))
+        self.assertEqual(lines, 50 * data1.splitlines(keepends=True))
 
     def test_readline(self):
         self.test_write()
@@ -340,7 +340,7 @@
 
     def test_textio_readlines(self):
         # Issue #10791: TextIOWrapper.readlines() fails when wrapping GzipFile.
-        lines = (data1 * 50).decode("ascii").splitlines(True)
+        lines = (data1 * 50).decode("ascii").splitlines(keepends=True)
         self.test_write()
         with gzip.GzipFile(self.filename, 'r') as f:
             with io.TextIOWrapper(f, encoding="ascii") as t:
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index 7666fe4..06132f2 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -304,7 +304,7 @@
         getlines = linecache.getlines
         def monkey(filename, module_globals=None):
             if filename == fn:
-                return source.splitlines(True)
+                return source.splitlines(keepends=True)
             else:
                 return getlines(filename, module_globals)
         linecache.getlines = monkey
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 2c502ab..117f8ab 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -1935,8 +1935,8 @@
         testdata = b"AAA\nBB\x00B\nCCC\rDDD\rEEE\r\nFFF\r\nGGG"
         normalized = testdata.replace(b"\r\n", b"\n").replace(b"\r", b"\n")
         for newline, expected in [
-            (None, normalized.decode("ascii").splitlines(True)),
-            ("", testdata.decode("ascii").splitlines(True)),
+            (None, normalized.decode("ascii").splitlines(keepends=True)),
+            ("", testdata.decode("ascii").splitlines(keepends=True)),
             ("\n", ["AAA\n", "BB\x00B\n", "CCC\rDDD\rEEE\r\n", "FFF\r\n", "GGG"]),
             ("\r\n", ["AAA\nBB\x00B\nCCC\rDDD\rEEE\r\n", "FFF\r\n", "GGG"]),
             ("\r",  ["AAA\nBB\x00B\nCCC\r", "DDD\r", "EEE\r", "\nFFF\r", "\nGGG"]),
diff --git a/Lib/test/test_nntplib.py b/Lib/test/test_nntplib.py
index ec790ad..d8e6332 100644
--- a/Lib/test/test_nntplib.py
+++ b/Lib/test/test_nntplib.py
@@ -1033,12 +1033,12 @@
         self.assertEqual(resp, success_resp)
         # With an iterable of terminated lines
         def iterlines(b):
-            return iter(b.splitlines(True))
+            return iter(b.splitlines(keepends=True))
         resp = self._check_post_ihave_sub(func, *args, file_factory=iterlines)
         self.assertEqual(resp, success_resp)
         # With an iterable of non-terminated lines
         def iterlines(b):
-            return iter(b.splitlines(False))
+            return iter(b.splitlines(keepends=False))
         resp = self._check_post_ihave_sub(func, *args, file_factory=iterlines)
         self.assertEqual(resp, success_resp)
 
diff --git a/Lib/test/test_pydoc.py b/Lib/test/test_pydoc.py
index ae56996..6d3923f 100644
--- a/Lib/test/test_pydoc.py
+++ b/Lib/test/test_pydoc.py
@@ -238,8 +238,8 @@
 def print_diffs(text1, text2):
     "Prints unified diffs for two texts"
     # XXX now obsolete, use unittest built-in support
-    lines1 = text1.splitlines(True)
-    lines2 = text2.splitlines(True)
+    lines1 = text1.splitlines(keepends=True)
+    lines2 = text2.splitlines(keepends=True)
     diffs = difflib.unified_diff(lines1, lines2, n=0, fromfile='expected',
                                  tofile='got')
     print('\n' + ''.join(diffs))
diff --git a/Lib/test/test_tokenize.py b/Lib/test/test_tokenize.py
index 9e9656c..af2bbf1 100644
--- a/Lib/test/test_tokenize.py
+++ b/Lib/test/test_tokenize.py
@@ -600,7 +600,7 @@
         f.close()
     tokens1 = [tok[:2] for tok in token_list]
     new_bytes = untokenize(tokens1)
-    readline = (line for line in new_bytes.splitlines(1)).__next__
+    readline = (line for line in new_bytes.splitlines(keepends=True)).__next__
     tokens2 = [tok[:2] for tok in tokenize(readline)]
     return tokens1 == tokens2
 
diff --git a/Lib/unittest/case.py b/Lib/unittest/case.py
index d82fa20..cc5f0c3 100644
--- a/Lib/unittest/case.py
+++ b/Lib/unittest/case.py
@@ -1010,8 +1010,8 @@
             if (len(first) > self._diffThreshold or
                 len(second) > self._diffThreshold):
                 self._baseAssertEqual(first, second, msg)
-            firstlines = first.splitlines(True)
-            secondlines = second.splitlines(True)
+            firstlines = first.splitlines(keepends=True)
+            secondlines = second.splitlines(keepends=True)
             if len(firstlines) == 1 and first.strip('\r\n') == first:
                 firstlines = [first + '\n']
                 secondlines = [second + '\n']