gh-104825: Remove implicit newline in the line attribute in tokens emitted in the tokenize module (#104846)

Lib/idlelib/idle_test/test_editor.py

@@ -201,8 +201,8 @@ class IndentSearcherTest(unittest.TestCase):
         test_info = (# text, (block, indent))
                      ("", (None, None)),
                      ("[1,", (None, None)),  # TokenError
-                     ("if 1:\n", ('if 1:\n', None)),
+                     ("if 1:\n", ('if 1:', None)),
-                     ("if 1:\n  2\n  3\n", ('if 1:\n', '  2\n')),
+                     ("if 1:\n  2\n  3\n", ('if 1:', '  2')),
                      )
         for code, expected_pair in test_info:
             with self.subTest(code=code):

Lib/test/test_tabnanny.py

@@ -222,7 +222,7 @@ class TestCheck(TestCase):
         """
         with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as file_path:
             out = f"{file_path!r}: *** Line 3: trouble in tab city! ***\n"
-            out += "offending line: '\\tprint(\"world\")\\n'\n"
+            out += "offending line: '\\tprint(\"world\")'\n"
             out += "inconsistent use of tabs and spaces in indentation\n"
 
             tabnanny.verbose = 1
@@ -231,7 +231,7 @@ class TestCheck(TestCase):
     def test_when_nannynag_error(self):
         """A python source code file eligible for raising `tabnanny.NannyNag`."""
         with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as file_path:
-            out = f"{file_path} 3 '\\tprint(\"world\")\\n'\n"
+            out = f"{file_path} 3 '\\tprint(\"world\")'\n"
             self.verify_tabnanny_check(file_path, out=out)
 
     def test_when_no_file(self):
@@ -341,7 +341,7 @@ class TestCommandLine(TestCase):
         """Should display more error information if verbose mode is on."""
         with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as path:
             stdout = textwrap.dedent(
-                "offending line: '\\tprint(\"world\")\\n'"
+                "offending line: '\\tprint(\"world\")'"
             ).strip()
             self.validate_cmd("-v", path, stdout=stdout, partial=True)
 
@@ -349,6 +349,6 @@ class TestCommandLine(TestCase):
         """Should display detailed error information if double verbose is on."""
         with TemporaryPyFile(SOURCE_CODES["nannynag_errored"]) as path:
             stdout = textwrap.dedent(
-                "offending line: '\\tprint(\"world\")\\n'"
+                "offending line: '\\tprint(\"world\")'"
             ).strip()
             self.validate_cmd("-vv", path, stdout=stdout, partial=True)

Lib/test/test_tokenize.py

@@ -103,7 +103,7 @@ def k(x):
             e.exception.msg,
             'unindent does not match any outer indentation level')
         self.assertEqual(e.exception.offset, 9)
-        self.assertEqual(e.exception.text, '  x += 5\n')
+        self.assertEqual(e.exception.text, '  x += 5')
 
     def test_int(self):
         # Ordinary integers and binary operators
@@ -1157,7 +1157,7 @@ class Test_Tokenize(TestCase):
 
         # skip the initial encoding token and the end tokens
         tokens = list(_tokenize(readline(), encoding='utf-8'))[:-2]
-        expected_tokens = [TokenInfo(3, '"ЉЊЈЁЂ"', (1, 0), (1, 7), '"ЉЊЈЁЂ"\n')]
+        expected_tokens = [TokenInfo(3, '"ЉЊЈЁЂ"', (1, 0), (1, 7), '"ЉЊЈЁЂ"')]
         self.assertEqual(tokens, expected_tokens,
                          "bytes not decoded with encoding")
 

Misc/NEWS.d/next/Core and Builtins/2023-05-24-09-59-56.gh-issue-104825.mQesie.rst

@@ -0,0 +1,2 @@
+Tokens emitted by the :mod:`tokenize` module do not include an implicit
+``\n`` character in the ``line`` attribute anymore. Patch by Pablo Galindo

Python/Python-tokenize.c

@@ -123,6 +123,8 @@ _tokenizer_error(struct tok_state *tok)
     int result = 0;
 
     Py_ssize_t size = tok->inp - tok->buf;
+    assert(tok->buf[size-1] == '\n');
+    size -= 1; // Remove the newline character from the end of the line
     error_line = PyUnicode_DecodeUTF8(tok->buf, size, "replace");
     if (!error_line) {
         result = -1;
@@ -193,6 +195,8 @@ tokenizeriter_next(tokenizeriterobject *it)
     }
 
     Py_ssize_t size = it->tok->inp - it->tok->buf;
+    assert(it->tok->buf[size-1] == '\n');
+    size -= 1; // Remove the newline character from the end of the line
     PyObject *line = PyUnicode_DecodeUTF8(it->tok->buf, size, "replace");
     if (line == NULL) {
         Py_DECREF(str);