python 如何从父类重载子类的属性？

  • Z时代
  • 2024-03-11
  • 分类：IT

python 如何从父类重载子类的属性？

源代码：

class FileSaverConf:
    STATIC_DIR = BASE_DIR / 'static'
    FILE_ENCODING = 'utf-8'
    FILE_SUFFIX = ''
class FileSaverConfForAddIndex(FileSaverConf):
    IS_SAVE = False
    STATIC_DIR = FileSaverConf.STATIC_DIR / 'add_index'
class FileSaverConfForSearch(FileSaverConf):
    IS_SAVE = False
    STATIC_DIR = FileSaverConf.STATIC_DIR / 'search'

但是我不想硬编码父类的名字

便下面使用 super() 替代 FileSaverConf 就会报错

python">class FileSaverConf:
    STATIC_DIR = BASE_DIR / 'static'
    FILE_ENCODING = 'utf-8'
    FILE_SUFFIX = ''
class FileSaverConfForAddIndex(FileSaverConf):
    IS_SAVE = False
    STATIC_DIR = super().STATIC_DIR / 'add_index'
class FileSaverConfForSearch(FileSaverConf):
    IS_SAVE = False
    STATIC_DIR = super().STATIC_DIR / 'search'

报错如下：

File "/Users/bot/Desktop/code/work/python/django/lsh/app.py", line 4, in <module>
    from utils.decorators import save_file
  File "/Users/bot/Desktop/code/work/python/django/lsh/utils/decorators.py", line 3, in <module>
    from conf.settings import (
  File "/Users/bot/Desktop/code/work/python/django/lsh/conf/settings.py", line 12, in <module>
    from .dev_settings import *
  File "/Users/bot/Desktop/code/work/python/django/lsh/conf/dev_settings.py", line 21, in <module>
    class FileSaverConfForAddIndex(FileSaverConf):
  File "/Users/bot/Desktop/code/work/python/django/lsh/conf/dev_settings.py", line 23, in FileSaverConfForAddIndex
    STATIC_DIR = super().STATIC_DIR / 'add_index'
RuntimeError: super(): no arguments

回答：

一个你可能不是很喜欢的写法

class FileSaverConf:
    FILE_ENCODING = 'utf-8'
    FILE_SUFFIX = ''
    @classmethod
    @property
    def STATIC_DIR(self):
        return "static/"
class FileSaverConfForAddIndex(FileSaverConf):
    IS_SAVE = False
    @classmethod
    @property
    def STATIC_DIR(self):
        return super().STATIC_DIR + 'search'

以上是 python 如何从父类重载子类的属性？ 的全部内容， 来源链接： utcz.com/p/938113.html

回到顶部