datacalssesã®ã‚¤ãƒ³ã‚¹ã‚¿ãƒ³ã‚¹ã‚’å«ã‚“ã 値をJSONã«ã™ã‚‹ã¨ãã®ãƒ¡ãƒ¢ - podhmo's diaryã„ã¤ã‚‚ã®ã‚„ã¤ã§ã™ã€‚対応ã—ã¦ã„ãªã„値をjson.dumps()ã«ä¸Žãˆã‚‹ã¨TypeErrorãŒç™ºç”Ÿã™ã‚‹ã‚„ã¤ã§ã™ã€‚ TypeError 例ãˆã°ã“ã†ã„ã†dataclassを定義ã—ã¦ã€‚ from dataclasses import dataclass, asdict @dataclass class Point: x: int y: int json.dumpsã™ã‚‹ã¨TypeError import json p = Point(x=1, y=2) # TypeError: Object of type Point is not JSON serializable print(json.dumps(p)) default ã„ã¤ã‚‚ã©ãŠã‚Šã«defaultを渡ã—ã¦ã‚ã’ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ã¡ã‚‡ã£ã¨ã‚ã‚“ã©ãã•ã„ã§ã™ãŒã€is_dataclassã¨ã„ã†é–¢æ•°ã§èª¿ã¹ã‚‰ã‚Œã‚‹ã®ã§ã©ã†ã«ã‹ãªã‚Šã¾ã™ã€‚ import json
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