style: change string to pass flake8

Author: stevenhua0320

.github/workflows/tests-on-pr-no-codecov.yml

@@ -11,6 +11,7 @@ jobs:
       project: diffpy.srxplanar
       c_extension: false
       headless: false
+      python_version: "3.13"
       run: |
         conda install pre-commit
         pre-commit run --all-files

pyproject.toml

@@ -14,7 +14,7 @@ maintainers = [
 description = "Distance Printer, calculate the inter atomic distances. Part of xPDFsuite"
 keywords = ['diffpy', 'pdf', 'data interpretation']
 readme = "README.rst"
-requires-python = ">=3.12, <3.15"
+requires-python = ">=3.11, <3.14"
 classifiers = [
         'Development Status :: 5 - Production/Stable',
         'Environment :: Console',

src/diffpy/srxplanar/srxplanar_app.py

@@ -0,0 +1,34 @@
+import argparse
+
+from diffpy.srxplanar.version import __version__  # noqa
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        prog="diffpy.srxplanar",
+        description=(
+            "Distance Printer, calculate the inter atomic distances."
+            " Part of xPDFsuite\n\n"
+            "For more information, visit: "
+            "https://github.com/diffpy/diffpy.srxplanar/"
+        ),
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+    )
+
+    parser.add_argument(
+        "--version",
+        action="store_true",
+        help="Show the program's version number and exit",
+    )
+
+    args = parser.parse_args()
+
+    if args.version:
+        print(f"diffpy.srxplanar {__version__}")
+    else:
+        # Default behavior when no arguments are given
+        parser.print_help()
+
+
+if __name__ == "__main__":
+    main()