From 8ed3cfa35f9265807bd6cdc89ff53e8cf0b548bf Mon Sep 17 00:00:00 2001
From: Turtle-Hwan <turtlehwan@gmail.com>
Date: Sun, 4 Jan 2026 23:37:42 +0900
Subject: [PATCH 1/2] Handle inline comments with empty values in parser

---
 src/dotenv/parser.py | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/dotenv/parser.py b/src/dotenv/parser.py
index eb100b47..f62dfcc9 100644
--- a/src/dotenv/parser.py
+++ b/src/dotenv/parser.py
@@ -21,7 +21,7 @@ def make_regex(string: str, extra_flags: int = 0) -> Pattern[str]:
 _export = make_regex(r"(?:export[^\S\r\n]+)?")
 _single_quoted_key = make_regex(r"'([^']+)'")
 _unquoted_key = make_regex(r"([^=\#\s]+)")
-_equal_sign = make_regex(r"(=[^\S\r\n]*)")
+_equal_sign = make_regex(r"(=)")
 _single_quoted_value = make_regex(r"'((?:\\'|[^'])*)'")
 _double_quoted_value = make_regex(r'"((?:\\"|[^"])*)"')
 _unquoted_value = make_regex(r"([^\r\n]*)")
@@ -155,7 +155,16 @@ def parse_binding(reader: Reader) -> Binding:
         reader.read_regex(_whitespace)
         if reader.peek(1) == "=":
             reader.read_regex(_equal_sign)
-            value: Optional[str] = parse_value(reader)
+
+            start_position = reader.position.chars
+            reader.read_regex(_whitespace)
+            consumed_whitespace = reader.position.chars > start_position
+
+            is_inline_comment = consumed_whitespace and reader.peek(1) == "#"
+            if is_inline_comment:
+                value: Optional[str] = ""
+            else:
+                value = parse_value(reader)
         else:
             value = None
         reader.read_regex(_comment)

From e8ba8a4c39690daed1fa7556a415f6bdf58e5f99 Mon Sep 17 00:00:00 2001
From: Turtle-Hwan <turtlehwan@gmail.com>
Date: Sun, 4 Jan 2026 23:49:04 +0900
Subject: [PATCH 2/2] Add tests for inline comments with empty values in parser

---
 tests/test_parser.py | 66 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/tests/test_parser.py b/tests/test_parser.py
index 43386e5a..6a9b8fbf 100644
--- a/tests/test_parser.py
+++ b/tests/test_parser.py
@@ -119,6 +119,72 @@
                 )
             ],
         ),
+        (
+            "a= # comment",
+            [
+                Binding(
+                    key="a",
+                    value="",
+                    original=Original(string="a= # comment", line=1),
+                    error=False,
+                )
+            ],
+        ),
+        (
+            "a=# comment",
+            [
+                Binding(
+                    key="a",
+                    value="# comment",
+                    original=Original(string="a=# comment", line=1),
+                    error=False,
+                )
+            ],
+        ),
+        (
+            "a=\t# comment",
+            [
+                Binding(
+                    key="a",
+                    value="",
+                    original=Original(string="a=\t# comment", line=1),
+                    error=False,
+                )
+            ],
+        ),
+        (
+            'a=""',
+            [
+                Binding(
+                    key="a",
+                    value="",
+                    original=Original(string='a=""', line=1),
+                    error=False,
+                )
+            ],
+        ),
+        (
+            "a=## comment",
+            [
+                Binding(
+                    key="a",
+                    value="## comment",
+                    original=Original(string="a=## comment", line=1),
+                    error=False,
+                )
+            ],
+        ),
+        (
+            "a=# # comment",
+            [
+                Binding(
+                    key="a",
+                    value="#",
+                    original=Original(string="a=# # comment", line=1),
+                    error=False,
+                )
+            ],
+        ),
         (
             "a=b c",
             [