Add option to read filename from command line

brain-jogging.py

@@ -5,6 +5,7 @@ from reportlab.platypus import SimpleDocTemplate, Table, TableStyle, Paragraph,
 from reportlab.lib.styles import getSampleStyleSheet
 from reportlab.pdfbase import pdfmetrics
 from reportlab.pdfbase.ttfonts import TTFont
+import argparse
 
 def format_and_return(a, b, operation, result):
     """
@@ -108,5 +109,13 @@ def create_brain_jogging_pdf(filename):
         table_with_results
     ])
 
+def main():
+    parser = argparse.ArgumentParser(description="Create a brain jogging PDF.")
+    parser.add_argument("filename", nargs="?", default="brain-jogging.pdf",
+                        help="The output PDF filename. (default: %(default)s)")
+
+    args = parser.parse_args()
+    create_brain_jogging_pdf(args.filename)
+
 if __name__ == "__main__":
-    create_brain_jogging_pdf("brain-jogging.pdf")
+    main()