Python flask json模式验证

from flask import Flask, request, jsonify
from marshmallow import Schema, fields, ValidationError

app = Flask(__name__)

class UserSchema(Schema):
    name = fields.Str(required=True)
    age = fields.Int(required=True, validate=lambda n: 18 <= n <= 99)
    email = fields.Email(required=True)

user_schema = UserSchema()

@app.route('/register', methods=['POST'])
def register():
    json_data = request.get_json()
    if not json_data:
        return jsonify({"message": "No input data provided"}), 400
    
    try:
        data = user_schema.load(json_data)
    except ValidationError as err:
        return jsonify(err.messages), 422
    
    # 这里可以处理验证通过的数据
    return jsonify({"message": "User registered successfully", "data": data}), 201

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

try:
    data = user_schema.load(json_data)
except ValidationError as err:
    return jsonify(err.messages), 422

class UserSchema(Schema):
    name = fields.Str(required=True)
    age = fields.Int(required=True)
    email = fields.Email(required=True)

class UserSchema(Schema):
    name = fields.Str()
    age = fields.Int()
    email = fields.Email()