rpy2 - 无法安装R软件包

Question

这是我的代码片段，我在python中安装R库RPostgreSQL

import rpy2.robjects as robjects
import rpy2.robjects.packages as rpackages
utils = rpackages.importr('utils')
utils.install_packages('RPostgreSQL')

但它会出错：

RRuntimeError                             Traceback (most recent call last)
<ipython-input-7-04e0baa1a451> in <module>()
----> 1 utils.install_packages('RPostgreSQL')

c:\users\postgres\appdata\local\programs\python\python36\lib\site- 
packages\rpy2\robjects\functions.py in __call__(self, *args, **kwargs)
176                 v = kwargs.pop(k)
177                 kwargs[r_k] = v
--> 178         return super(SignatureTranslatedFunction, 
self).__call__(*args, **kwargs)
179 
180 pattern_link = re.compile(r'\\link\{(.+?)\}')

c:\users\postgres\appdata\local\programs\python\python36\lib\site- 
packages\rpy2\robjects\functions.py in __call__(self, *args, **kwargs)
104         for k, v in kwargs.items():
105             new_kwargs[k] = conversion.py2ri(v)
--> 106         res = super(Function, self).__call__(*new_args, 
**new_kwargs)
107         res = conversion.ri2ro(res)
108         return res

RRuntimeError: Error in (function (pkgs, lib, repos = getOption("repos"), 
contriburl = contrib.url(repos,  : 
unable to install packages

我已经尝试了很多建议，这是我的.libpaths和库postgresql都安装在两者中。有什么帮助吗？

RStudio

"C:/Users/postgres/R/win-library/3.5"
"C:/Program Files/R/R-3.5.0/library"