Add default file to example persistent_params_from_file

examples/parameters/persistent_params_from_file.py

@@ -33,23 +33,25 @@
 """
 import argparse
 import logging
+import os
 
 import cflib.crtp
 from cflib.crazyflie import Crazyflie
 from cflib.crazyflie.syncCrazyflie import SyncCrazyflie
 from cflib.utils import uri_helper
 from cflib.utils.param_file_helper import ParamFileHelper
 
-
 uri = uri_helper.uri_from_env(default='radio://0/80/2M/E7E7E7E7E7')
 
 # Only output errors from the logging framework
 logging.basicConfig(level=logging.ERROR)
 
+default_file = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'persistent_params_from_file.yaml')
 
 if __name__ == '__main__':
     parser = argparse.ArgumentParser()
-    parser.add_argument('-f', '--file', type=str, help='The yaml file containing the arguments. ')
+    parser.add_argument('-f', '--file', type=str, default=default_file,
+                        help='The yaml file containing the arguments. (default: params.yaml)')
     args = parser.parse_args()
 
     cflib.crtp.init_drivers()

examples/parameters/persistent_params_from_file.yaml

@@ -0,0 +1,8 @@
+# Example file for writing persistent parameters using a file
+params:
+  activeMarker.back:
+    default_value: 3
+    is_stored: true
+    stored_value: 30
+type: persistent_param_state
+version: '1'