处理异常的最pythonic方式

Question

我有这个代码：

normalize_data['key1'] = json.loads(normalize_data.get('key1', ''))
normalize_data['key2'] = [key for key in
                                json.loads(normalize_data.get('key2', '[]'))]
normalize_data['key3'] = [json.loads(normalize_data.get('key3', ''))]
normalize_data['key4'] = [json.loads(normalize_data.get('key4', ''))]

如您所见，每个键的处理方式都不同。如果缺少任何键，它将引发 JSONEncodeError。如果任何键的任何值的格式错误，都会引发 TypeError。处理这些的最pythonic方式是什么？我试着把它放在上面的代码之前：

for key in ['key1', 'key2', 'key3', 'key4']:
    if key not in normalize_data:
        raise serializers.ValidationError({'error': f'Field {key} is missing'})
    try:
        json.loads(normalize_data[key])
    except TypeError:
        raise serializers.ValidationError({'error': f'Wrong format of {key}'})

但我不是很喜欢。谢谢大家

Answer 1

会有人质疑，但我会这样做：-

for key in ['key1', 'key2', 'key3', 'key4']:
  try:
    json.loads(normalize_data[key])
  except TypeError:
    raise serializers.ValidationError({'error': f'Wrong format of {key}'})
  except KeyError:
    raise serializers.ValidationError({'error': f'Field {key} is missing'})

Answer 2

也许：

for key in ['key1', 'key2', 'key3', 'key4']:
    try:
        json.loads(normalize_data[key])
    except KeyError:
        raise serializers.ValidationError({'error': f'Field {key} is missing'})
    except TypeError:
        raise serializers.ValidationError({'error': f'Wrong format of {key}'})

处理异常的最pythonic方式

The most pythonic way of handling exceptions

python

django

exception