From aad985612a629d1a3f3e05b810b334ceacf47d89 Mon Sep 17 00:00:00 2001
From: Sanyam Khurana <8039608+CuriousLearner@users.noreply.github.com>
Date: Sat, 20 Jan 2018 08:42:22 +0530
Subject: [PATCH] bpo-32028: Fix suggestions for indented print statements
 (GH-4688)

The suggested replacement for print statements previously failed to account
for leading whitespace and hence could end up including unwanted text in
the proposed call to the print builtin.

Patch by Sanyam Khurana.
(cherry picked from commit d57f26c753dce61f72b52b96db3a3253d9f2fc3e)
---
 Lib/test/test_print.py                           |  9 +++++++++
 .../2017-12-03-22-29-13.bpo-32028.KC2w4Q.rst     |  3 +++
 Objects/exceptions.c                             | 16 +++++++++++-----
 3 files changed, 23 insertions(+), 5 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2017-12-03-22-29-13.bpo-32028.KC2w4Q.rst

diff --git a/Lib/test/test_print.py b/Lib/test/test_print.py
index e6434feaf5eec6..7bc23cf9fc63aa 100644
--- a/Lib/test/test_print.py
+++ b/Lib/test/test_print.py
@@ -156,6 +156,15 @@ def test_string_with_excessive_whitespace(self):
 
         self.assertIn('print("Hello World", end=" ")', str(context.exception))
 
+    def test_string_with_leading_whitespace(self):
+        python2_print_str = '''if 1:
+            print "Hello World"
+        '''
+        with self.assertRaises(SyntaxError) as context:
+            exec(python2_print_str)
+
+        self.assertIn('print("Hello World")', str(context.exception))
+
     def test_stream_redirection_hint_for_py2_migration(self):
         # Test correct hint produced for Py2 redirection syntax
         with self.assertRaises(TypeError) as context:
diff --git a/Misc/NEWS.d/next/Core and Builtins/2017-12-03-22-29-13.bpo-32028.KC2w4Q.rst b/Misc/NEWS.d/next/Core and Builtins/2017-12-03-22-29-13.bpo-32028.KC2w4Q.rst
new file mode 100644
index 00000000000000..8e2b2e1b35038b
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2017-12-03-22-29-13.bpo-32028.KC2w4Q.rst	
@@ -0,0 +1,3 @@
+Leading whitespace is now correctly ignored when generating suggestions
+for converting Py2 print statements to Py3 builtin print function calls.
+Patch by Sanyam Khurana.
diff --git a/Objects/exceptions.c b/Objects/exceptions.c
index df4899372a560b..0a75f1b0fe64c6 100644
--- a/Objects/exceptions.c
+++ b/Objects/exceptions.c
@@ -2865,17 +2865,23 @@ _set_legacy_print_statement_msg(PySyntaxErrorObject *self, Py_ssize_t start)
 
     // PRINT_OFFSET is to remove `print ` word from the data.
     const int PRINT_OFFSET = 6;
-    Py_ssize_t text_len = PyUnicode_GET_LENGTH(self->text);
-    PyObject *data = PyUnicode_Substring(self->text, PRINT_OFFSET, text_len);
-
+    const int STRIP_BOTH = 2;
+    // Issue 32028: Handle case when whitespace is used with print call
+    PyObject *initial_data = _PyUnicode_XStrip(self->text, STRIP_BOTH, strip_sep_obj);
+    if (initial_data == NULL) {
+        Py_DECREF(strip_sep_obj);
+        return -1;
+    }
+    Py_ssize_t text_len = PyUnicode_GET_LENGTH(initial_data);
+    PyObject *data = PyUnicode_Substring(initial_data, PRINT_OFFSET, text_len);
+    Py_DECREF(initial_data);
     if (data == NULL) {
         Py_DECREF(strip_sep_obj);
         return -1;
     }
-    PyObject *new_data = _PyUnicode_XStrip(data, 2, strip_sep_obj);
+    PyObject *new_data = _PyUnicode_XStrip(data, STRIP_BOTH, strip_sep_obj);
     Py_DECREF(data);
     Py_DECREF(strip_sep_obj);
-
     if (new_data == NULL) {
         return -1;
     }