Python dictionary, get values by key name - python-3.x

Question

I have nested dictionary , trying to iterate over it and get the values by key,
I have a payload which has route as main node, inside route i have many waypoints, i would like to iterate over all way points and sets the value based on key name into a protobuff variable.
sample code below:
'payload':
{
'route':
{
'name': 'Argo',
'navigation_type': 2,
'backtracking': False,
'continuous': False,
'waypoints':
{
'id': 2,
'coordinate':
{
'type': 0,
'x': 51.435989,
'y': 25.32838,
'z': 0
},
'velocity': 0.55555582,
'constrained': True,
'action':
{
'type': 1,
'duration': 0
}
}
'waypoints':
{
'id': 2,
'coordinate':
{
'type': 0,
'x': 51.435989,
'y': 25.32838,
'z': 0
},
'velocity': 0.55555582,
'constrained': True,
'action':
{
'type': 1,
'duration': 0
}
}
},
'waypoint_status_list':
{
'id': 1,
'status': 'executing'
},
'autonomy_status': 3
},
#method to iterate over payload
def get_encoded_payload(self, payload):
#1 fill route proto from payload
a = payload["route"]["name"] #working fine
b = payload["route"]["navigation_type"] #working fine
c = payload["route"]["backtracking"] #working fine
d = payload["route"]["continuous"] #working fine
self.logger.debug(type(payload["route"]["waypoints"])) # type is dict
#iterate over waypoints
for waypoint in payload["route"]["waypoints"]:
wp_id = waypoint["id"] # Error, string indices must be integer
i would like to iterate over all waypoints and set the value of each key value to a variable

Answer 1

self.logger.debug(type(payload["route"]["waypoints"])) # type is dict
Iterating over a dict gives you its keys. Your later code seems to be expecting multiple waypoints as a list of dicts, which would work, but that's not what your structure actually contains.
Try print(waypoint) and see what you get.