Fix: Handle Trailing Commas and Empty Strings in File Paths

mypy/config_parser.py

@@ -277,6 +277,12 @@ def parse_config_file(
             print(f"{file_read}: No [mypy] section in config file", file=stderr)
     else:
         section = parser["mypy"]
+
+        # if "files" in section:
+        #     raw_files = section["files"]
+        #     normalized_files = [file.strip() for file in raw_files.split(",") if file.strip()]
+        #     section["files"] = ",".join(normalized_files)
+
         prefix = f"{file_read}: [mypy]: "
         updates, report_dirs = parse_section(
             prefix, options, set_strict_flags, section, config_types, stderr

mypy/test/testconfigparser.py

@@ -0,0 +1,35 @@
+import configparser
+
+from mypy.config_parser import parse_config_file
+from mypy.options import Options
+
+
+def test_parse_files_normalization():
+    options = Options()
+    config = """
+    [mypy]
+    files = file1.py, file2.py, file3.py, ,
+    """
+
+    parser = configparser.ConfigParser()
+    parser.read_string(config)
+
+    parse_config_file(options, lambda: None, None, stdout=None, stderr=None)
+
+    # Assert that the trailing commas and empty strings are removed
+    assert options.files == ["file1.py", "file2.py", "file3.py"]
+
+
+def test_parse_files_with_empty_strings():
+    options = Options()
+    config = """
+    [mypy]
+    files = ,file1.py,,file2.py
+    """
+    parser = configparser.RawConfigParser()
+    parser.read_string(config)
+
+    parse_config_file(options, lambda: None, None, stdout=None, stderr=None)
+
+    # Assert that empty strings are ignored
+    assert options.files == ["file1.py", "file2.py"]