[Python] Plus and equal increment operator not allowed inside dictionary

In the dictionary below, id_count gets incremented as soon as the loop begins just before the dictionary is created. I need to increment it again inside the dictionary within locations id. Why is the += operator not allowed inside the dictionary?


for i in range(0, len(all_locations)):
id_count += 1
object_sequence_count += 1
object_data_output = {
"id": id_count,
"sequence": object_sequence_count,
"coordinate":{
"x": all_locations["coordinate"]["x"],
"y": all_locations["coordinate"]["y"],
"objIdentifier": all_locations["materialIdentifier"],
"location":[
{
"id": id_count += 1 #where the error is occurring
}
]
}
}

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