Fill Missing Values

Given a list of dictionaries representing rows, fill any None values in the specified column with a given default value.

Example

data = [
  {"name": "Alice", "score": 90},
  {"name": "Bob", "score": None},
  {"name": "Charlie", "score": 85}
]
fill_missing(data, "score", 0)
# => [{"name": "Alice", "score": 90}, {"name": "Bob", "score": 0}, {"name": "Charlie", "score": 85}]