From abd079806d5f676410fbeaf1a7980f75f85833f7 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Fri, 15 Mar 2024 10:52:00 +0100
Subject: [3.12] gh-90095: Ignore empty lines and comments in `.pdbrc`
 (GH-116834) (#116854)

gh-90095: Ignore empty lines and comments in `.pdbrc` (GH-116834)
(cherry picked from commit a50cf6c3d76b34e2ee9f92a248f1b0df24e407f6)

Co-authored-by: Tian Gao <gaogaotiantian@hotmail.com>
---
 Doc/library/pdb.rst                                   |  3 ++-
 Lib/pdb.py                                            |  5 ++++-
 Lib/test/test_pdb.py                                  | 19 +++++++++++++++++++
 .../2024-03-14-20-59-28.gh-issue-90095.7UaJ1U.rst     |  1 +
 4 files changed, 26 insertions(+), 2 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2024-03-14-20-59-28.gh-issue-90095.7UaJ1U.rst

diff --git a/Doc/library/pdb.rst b/Doc/library/pdb.rst
index d9cb9a4..b8f15aa 100644
--- a/Doc/library/pdb.rst
+++ b/Doc/library/pdb.rst
@@ -284,7 +284,8 @@ There are three preset *convenience variables*:
 
 If a file :file:`.pdbrc` exists in the user's home directory or in the current
 directory, it is read with ``'utf-8'`` encoding and executed as if it had been
-typed at the debugger prompt.  This is particularly useful for aliases.  If both
+typed at the debugger prompt, with the exception that empty lines and lines
+starting with ``#`` are ignored.  This is particularly useful for aliases.  If both
 files exist, the one in the home directory is read first and aliases defined there
 can be overridden by the local file.
 
diff --git a/Lib/pdb.py b/Lib/pdb.py
index b76a683..225c9f2 100755
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -301,7 +301,10 @@ class Pdb(bdb.Bdb, cmd.Cmd):
         self.set_convenience_variable(self.curframe, '_frame', self.curframe)
 
         if self.rcLines:
-            self.cmdqueue = self.rcLines
+            self.cmdqueue = [
+                line for line in self.rcLines
+                if line.strip() and not line.strip().startswith("#")
+            ]
             self.rcLines = []
 
     # Override Bdb methods
diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index db30412..5bdc5f2 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -2212,8 +2212,27 @@ def bœr():
         """)
 
         stdout, stderr = self.run_pdb_script(script, 'q\n', pdbrc=pdbrc, remove_home=True)
+        self.assertNotIn("SyntaxError", stdout)
         self.assertIn("a+8=9", stdout)
 
+    def test_pdbrc_empty_line(self):
+        """Test that empty lines in .pdbrc are ignored."""
+
+        script = textwrap.dedent("""
+            a = 1
+            b = 2
+            c = 3
+        """)
+
+        pdbrc = textwrap.dedent("""
+            n
+
+        """)
+
+        stdout, stderr = self.run_pdb_script(script, 'q\n', pdbrc=pdbrc, remove_home=True)
+        self.assertIn("b = 2", stdout)
+        self.assertNotIn("c = 3", stdout)
+
     def test_pdbrc_alias(self):
         script = textwrap.dedent("""
             class A:
diff --git a/Misc/NEWS.d/next/Library/2024-03-14-20-59-28.gh-issue-90095.7UaJ1U.rst b/Misc/NEWS.d/next/Library/2024-03-14-20-59-28.gh-issue-90095.7UaJ1U.rst
new file mode 100644
index 0000000..b7024c7
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-03-14-20-59-28.gh-issue-90095.7UaJ1U.rst
@@ -0,0 +1 @@
+Ignore empty lines and comments in ``.pdbrc``
-- 
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