Python 如何更改RS4类属性-rpy2的默认值

我通过以下操作在python中映射一个类RS4：

from rpy2.robjects.packages import importr
import rpy2.robjects as ro

class MapTOS4(ro.methods.RS4):
    """
    writing a child class to map to S4 reference class in python
    """
    def LoadFile(self, filename):
        """access the LoadFile method of SlicedData class"""

        return ro.baseenv['$'](self, 'LoadFile')(filename)
    
    def fileSliceSize(self):
        """access the class attribute or field""" 
        return ro.baseenv['$'](self, 'fileSliceSize')
    
mql = importr('MatrixEQTL')
data = MapTOS4(mql.SlicedData())
print(data.fileSliceSize())

在执行上述代码时，我得到了以下预期值

[1]1000

，因为在该特定包中，类字段/属性

fileSliceSize

的默认值设置为1000。但是，我正在尝试将该类属性的值重置或更改为2000

在R中，您可以通过以下简单的代码轻松完成这一任务：

data$fileSliceSize = 2000 

基于我在Python中的实现，如何实现这一点

---

提前非常感谢。

在R中，

data$fileSliceSize=2000

操作只是调用

$Thanky you@krassowski的语法糖，非常感谢您的回答，它很有效，现在我可以获取和设置类属性了。是否有一种方法可以设置和获取属性，而不必使用“get_r_attribute=ro.baseenv['$']和set_r_attribute=ro.baseenv”['$你为什么不喜欢get_r_属性和set_r_属性？我真的很喜欢它，但我想看看是否有办法让它更像Python？如果我要修改某些东西，我会保留
get_r_属性
/
set_r_属性
（它们解释了发生了什么），但是尝试使用
\uuuu getattr\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu呃，我投票赞成，我会接受你的回答。
library(MatrixEQTL)
data = SlicedData()

`$<-`(data, 'fileSliceSize', 2000)
# SlicedData object. For more information type: ?SlicedData
# Number of columns: 0 
# Number of rows: 0 
# Data is stored in 0 slices

`$`(data, 'fileSliceSize')
# [1] 2000

`print`('text')
# [1] "text"

ro.baseenv['$<-'](data, 'fileSliceSize', 2000)

from rpy2.robjects.packages import importr
import rpy2.robjects as ro


# assigning these R operators here will make the code easier to read
# and provide a (negligible in this case) performance increase.
get_r_attribute = ro.baseenv['$']
set_r_attribute = ro.baseenv['$<-']


class MapTOS4(ro.methods.RS4): 

    def __init__(self, r_obj, file_slice_size=2000): 
        super().__init__(r_obj) 
        self.file_slice_size = file_slice_size

    def load_file(self, filename):
        return get_r_attribute(self, 'LoadFile')(filename)

    @property
    def file_slice_size(self):
        return get_r_attribute(self, 'fileSliceSize') 

    @file_slice_size.setter 
    def file_slice_size(self, value): 
        set_r_attribute(self, 'fileSliceSize', value)


mql = importr('MatrixEQTL') 
data = MapTOS4(mql.SlicedData()) 
print(data.file_slice_size)
# prints 2000
data.file_slice_size = 3000
print(data.file_slice_size)
# prints 3000

# setting a value initialization:
data = MapTOS4(mql.SlicedData(), file_slice_size=4000)
print(data.file_slice_size)
# prints 4000