使用rpy2将Python变量传递给R [英] Passing a Python variable to R using rpy2

问题描述

我有基本的R脚本，可以对MySQL数据集执行GLM.在bash中使用Rscript可以很好地运行.但是我想在python脚本中调用它，以便可以将其添加到循环中，可以创建sql语句，但似乎无法使用rpy2将其传递给R；

I have basic R script that performs a GLM on a MySQL dataset. This runs fine using Rscript in bash. However I would like to call it within a python script so I can add it to a loop, I can create the sql statement but I can't seem to pass it to R using rpy2;

for word in words:
    sql_scores = "select a.article_id, response, score  from scores as a join profile as b on a.article_id = b.article_id where response in (1,0) and keyword = '%s';" % (word[0])
    robjects.r("library(RMySQL)")
    robjects.r("mydb = dbConnect(MySQL(), user='me', password='xxxx', host='aws.host', dbname='mydb')")
    robjects.r("results = fetch(dbSendQuery(mydb, '%s'))") % (sql_scores)
    robjects.r("model <- glm(response ~ score , data=results, family=binomial)")
    robjects.r("summary(model)")

如果我打印sql_scores，则可以直接在MySQL中运行此命令.但是Python会产生此错误；

If I print sql_scores I can run this fine directly in MySQL. However Python produces this error;

Loading required package: DBI
Traceback (most recent call last):
  File "keyword_searcher.py", line 30, in <module>
    robjects.r("results = fetch(dbSendQuery(mydb, '%s'))") % (sql_scores)
  File "/usr/local/lib/python2.7/dist-packages/rpy2/robjects/__init__.py", line 268, in __call__
    p = rinterface.parse(string)
 ValueError: Error while parsing the string.

我无法确定以下内容的正确语法:

I can't figure out the proper syntax for:

robjects.r("results = fetch(dbSendQuery(mydb, %s))") % (sql_scores)

推荐答案

在"%s"周围使用双引号，并在robjects.r字符串周围使用单引号:

Use double quotes around the "%s" and single quotes around the robjects.r string:

robjects.r('results = fetch(dbSendQuery(mydb, "%s"))') % (sql_scores)

或使用format()方法:

robjects.r('fetch(dbSendQuery(mydb, {0}))'.format(sql_scores))

这篇关于使用rpy2将Python变量传递给R的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！