diff --git a/borgmatic/actions/pattern.py b/borgmatic/actions/pattern.py
index 52aad34d..6c2ced3f 100644
--- a/borgmatic/actions/pattern.py
+++ b/borgmatic/actions/pattern.py
@@ -68,7 +68,7 @@ def collect_patterns(config):
             + tuple(
                 parse_pattern(pattern_line.strip())
                 for filename in config.get('patterns_from', ())
-                for pattern_line in open(filename, encoding='utf-8').readlines()
+                for pattern_line in open(filename, encoding='utf-8')
                 if not pattern_line.lstrip().startswith('#')
                 if pattern_line.strip()
             )
@@ -78,7 +78,7 @@ def collect_patterns(config):
                     borgmatic.borg.pattern.Pattern_style.FNMATCH,
                 )
                 for filename in config.get('exclude_from', ())
-                for exclude_line in open(filename, encoding='utf-8').readlines()
+                for exclude_line in open(filename, encoding='utf-8')
                 if not exclude_line.lstrip().startswith('#')
                 if exclude_line.strip()
             )
diff --git a/borgmatic/config/generate.py b/borgmatic/config/generate.py
index e22c452c..43227590 100644
--- a/borgmatic/config/generate.py
+++ b/borgmatic/config/generate.py
@@ -168,11 +168,7 @@ def render_configuration(config):
         rendered,
         # Dumping certain values (integers, for instance) causes ruamel.yaml to append an
         # end-of-document "..." marker. Strip it.
-        transform=lambda dumped: (
-            dumped[: -len(RUAMEL_YAML_END_OF_DOCUMENT_MARKER)]
-            if dumped.endswith(RUAMEL_YAML_END_OF_DOCUMENT_MARKER)
-            else dumped
-        ),
+        transform=lambda dumped: dumped.removesuffix(RUAMEL_YAML_END_OF_DOCUMENT_MARKER),
     )
 
     return rendered.getvalue()
diff --git a/tests/integration/config/test_schema.py b/tests/integration/config/test_schema.py
index 4d12bb33..dc04cecd 100644
--- a/tests/integration/config/test_schema.py
+++ b/tests/integration/config/test_schema.py
@@ -10,7 +10,7 @@ MAXIMUM_LINE_LENGTH = 80
 def test_schema_line_length_stays_under_limit():
     schema_file = open(borgmatic.config.validate.schema_filename())
 
-    for line in schema_file.readlines():
+    for line in schema_file:
         assert len(line.rstrip('\n')) <= MAXIMUM_LINE_LENGTH