Flask中返回的字典显示空的大括号

data = {
    'key1': 'value1',
    'key2': 'value2'
}
return jsonify(data)

data = {}
if some_condition:
    data['key'] = 'value'
return jsonify(data)

result = db.session.query(SomeModel).all()
data = [{'id': item.id, 'name': item.name} for item in result]
return jsonify(data)

from flask import Flask, jsonify

app = Flask(__name__)

@app.route('/data', methods=['GET'])
def get_data():
    data = {
        'message': 'Hello, World!',
        'status': 'success'
    }
    return jsonify(data)

if __name__ == '__main__':
    app.run(debug=True)