如何使用python根据列表中出现的父值来提取子值？

relationships = [
    {"parent": "A", "child": "B"},
    {"parent": "A", "child": "C"},
    {"parent": "B", "child": "D"},
    {"parent": "C", "child": "E"},
    {"parent": "D", "child": "F"}
]

def extract_children(parent, relationships):
    children = []
    for relationship in relationships:
        if relationship["parent"] == parent:
            children.append(relationship["child"])
    return children

parent = "A"
children = extract_children(parent, relationships)
print(children)