Add option to pass a different file

time.txt in the current directory is the default, but another path can be passed too.

tx

@@ -1,8 +1,21 @@
 #!/usr/bin/env python3
 
 from datetime import datetime, timedelta
+import argparse
 
+# Parse command line arguments
+parser = argparse.ArgumentParser(description="Description")
+ 
+# add arguments to the parser
+parser.add_argument("-f", "--file")
+
+args = parser.parse_args()
+
+if args.file:
+    time_file = open(args.file,'r')
+else:
     time_file = open('time.txt','r')
+
 total_time = timedelta()
 
 for line in time_file: