Python 在 Pandas 中加载 .rds 文件
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Loading a .rds file in Pandas
提问by D1X
I have downloaded a file with format .rds, How can I load this with Pandas? It is supposed to be an R file but I haven't been able to find any info about how to load it.
我已经下载了一个 .rds 格式的文件，我如何用 Pandas 加载它？它应该是一个 R 文件，但我无法找到有关如何加载它的任何信息。
回答by mgalardini
You could use the rpy2 interface to Pandas, in the following manner:
您可以通过以下方式使用rpy2 接口到 Pandas：
import rpy2.robjects as robjects
from rpy2.robjects import pandas2ri
pandas2ri.activate()
readRDS = robjects.r['readRDS']
df = readRDS('my_file.rds')
df = pandas2ri.ri2py(df)
# do something with the dataframe
回答by Otto Fajardo
If you would prefer not having to install R (rpy2 requires it), there is a new package "pyreadr" to read Rds and RData files very easily.
如果您不想安装 R（rpy2 需要它），有一个新包“pyreadr”可以非常轻松地读取 Rds 和 RData 文件。
It is a wrapper around the C library librdata, so it is very fast.
它是 C 库 librdata 的包装器，因此速度非常快。
You can install it easily with pip:
您可以使用 pip 轻松安装它：
pip install pyreadr
Then you can read your rds file:
然后你可以读取你的 rds 文件：
import pyreadr
result = pyreadr.read_r('/path/to/file.Rds') # also works for RData
# done!
# result is a dictionary where keys are the name of objects and the values python
# objects. In the case of Rds there is only one object with None as key
df = result[None] # extract the pandas data frame
The repo is here: https://github.com/ofajardo/pyreadr
回购在这里：https: //github.com/ofajardo/pyreadr
Disclaimer: I am the developer of this package.
免责声明：我是这个包的开发者。
回答by user2032994
To follow up on @mgalardini's answer, in newer versions of rpy2 (version 3.0.4), the method that converts R dataframe to pandas dataframe has changed:
为了跟进@mgalardini 的回答，在较新版本的 rpy2（3.0.4 版）中，将 R 数据帧转换为 Pandas 数据帧的方法已更改：
>>> rpy2.__version__
'3.0.4'
>>> import rpy2.robjects as robjects
>>> from rpy2.robjects import pandas2ri
>>> readRDS = robjects.r['readRDS']
>>> df = readRDS('my_file.rds')
>>> df = pandas2ri.rpy2py_dataframe(df)
