diff --git a/rdata/tests/test_rdata.py b/rdata/tests/test_rdata.py
index 53c3f29..5783d19 100644
--- a/rdata/tests/test_rdata.py
+++ b/rdata/tests/test_rdata.py
@@ -711,12 +711,12 @@ def test_ascii(self) -> None:
     def test_ascii_characters(self) -> None:
         """Test reading string with all ascii printable characters."""
         data = rdata.read_rds(TESTDATA_PATH / "test_ascii_chars.rds")
-        assert data == "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~ \t\n\r\v\f\r\n", data
+        assert data == "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~ \t\n\r\v\f\r\n", data  # noqa: E501
 
     def test_ascii_ascii_characters(self) -> None:
         """Test reading string with all ascii printable characters."""
         data = rdata.read_rds(TESTDATA_PATH / "test_ascii_ascii_chars.rds")
-        assert data == "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~ \t\n\r\v\f\r\n", data
+        assert data == "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~ \t\n\r\v\f\r\n", data  # noqa: E501
 
     def test_nan_inf(self) -> None:
         """Test reading nan and inf."""
diff --git a/rdata/unparser/_ascii.py b/rdata/unparser/_ascii.py
index bc1e2cc..50d9bc0 100644
--- a/rdata/unparser/_ascii.py
+++ b/rdata/unparser/_ascii.py
@@ -83,11 +83,13 @@ def unparse_string(self, value: bytes) -> None:
         # - ' '  that Python writes as ' ',    but R as '\040'
         # - '\v' that Python writes as '\x0b', but R as '\v'
         # - '\f' that Python writes as '\x0c', but R as '\f'
-        write_raw = string.printable.replace(' ', '').replace('\v', '').replace('\f', '')
+        write_raw = string.printable.replace(" ", "")\
+                                    .replace("\v", "")\
+                                    .replace("\f", "")
 
         def escape(b: bytes) -> str:
-            """Escape string, e.g., b'\n' -> r'\\n'"""
-            return b.decode('latin1').encode('unicode_escape').decode('ascii')
+            r"""Escape string, e.g., b'\n' -> r'\\n'."""
+            return b.decode("latin1").encode("unicode_escape").decode("ascii")
 
         # Go though the string byte-by-byte as we need to
         # convert every non-ascii character separately