added a python tag to Wush's initial python from R post

Author: eddelbuettel

_posts/2014-04-06-rcpp-python.md

@@ -2,15 +2,14 @@
 title: Call Python from R through Rcpp
 author: Wush Wu
 license: GPL (>= 2)
-tags: featured boost 
+tags: featured boost python
 summary: Integrate Python into R via Rcpp and Boost.Python
 layout: post
 src: 2014-04-06-rcpp-python.Rmd
 ---
 
 
 
-
 ## Introduction
 
 This post provides a brief introduction to calling Python from R through Rcpp. The
@@ -49,7 +48,6 @@ py_ldflags <- system("python2.7-config --ldflags", intern=TRUE)
 Sys.setenv("PKG_LIBS"=sprintf("%s %s %s", Sys.getenv("PKG_CFLAGS"), "-lboost_python-py27", py_ldflags))
 {% endhighlight %}
 
-
 The following `hello world` should then work:
 
 
@@ -81,9 +79,6 @@ void hello_python() {
 
 
 
-
-
-
 Let's call them in R:
 
 
@@ -93,12 +88,10 @@ hello_python()
 {% endhighlight %}
 
 
-
 <pre class="output">
-Today is Sun Apr  6 09:03:02 2014
+Today is Thu Apr  2 11:32:17 2015
 </pre>
 
-
 It shows that the `hello_python` function successfully initializes the Python
 engine and runs the Python script through `PyRun_SimpleString`.
 
@@ -132,18 +125,16 @@ SEXP IntVec_to_py_list(IntegerVector src) {
 {% endhighlight %}
 
 
-
 {% highlight r %}
 IntVec_to_py_list(1:10)
 {% endhighlight %}
 
 
 
 <pre class="output">
-&lt;pointer: 0x19d1f80&gt;
+&lt;pointer: 0x8e0b410&gt;
 </pre>
 
-
 The pointer refers to the memory of the transformed Python object.
 
 ## Call Python Function
@@ -180,7 +171,6 @@ void pyfun(std::string fun_name, SEXP fun_argument) {
 {% endhighlight %}
 
 
-
 {% highlight r %}
 pycall("
 def print_list(src):
@@ -206,7 +196,6 @@ pyfun("print_list", a)
 10
 </pre>
 
-
 ## Error Handling
 
 Errors in the Python engine can be handled easily by the C++ `try/catch`
@@ -240,7 +229,6 @@ void pyfun(std::string fun_name, SEXP fun_argument) {
 {% endhighlight %}
 
 
-
 {% highlight r %}
 pycall("
 def print_list(src):
@@ -257,21 +245,20 @@ pyfun("print_lists", a) # a typo of the function name
 KeyError: 'print_lists'
 Error in sys.excepthook:
 Traceback (most recent call last):
-  File &quot;/usr/lib/python2.7/dist-packages/apport_python_hook.py&quot;, line 64, in apport_excepthook
+  File &quot;/usr/lib/python2.7/dist-packages/apport_python_hook.py&quot;, line 63, in apport_excepthook
     from apport.fileutils import likely_packaged, get_recent_crashes
   File &quot;/usr/lib/python2.7/dist-packages/apport/__init__.py&quot;, line 5, in &lt;module&gt;
     from apport.report import Report
   File &quot;/usr/lib/python2.7/dist-packages/apport/report.py&quot;, line 16, in &lt;module&gt;
     from xml.parsers.expat import ExpatError
   File &quot;/usr/lib/python2.7/xml/parsers/expat.py&quot;, line 4, in &lt;module&gt;
     from pyexpat import *
-ImportError: /usr/lib/python2.7/lib-dynload/pyexpat.x86_64-linux-gnu.so: undefined symbol: _Py_ZeroStruct
+ImportError: /usr/lib/python2.7/lib-dynload/pyexpat.i386-linux-gnu.so: undefined symbol: _Py_ZeroStruct
 
 Original exception was:
 KeyError: 'print_lists'
 </pre>
 
-
 ## Summary
 
 These examples show how to integrate Python and R with Rcpp and Boost.Python.

src/2014-04-06-rcpp-python.Rmd

@@ -2,7 +2,7 @@
 title: Call Python from R through Rcpp
 author: Wush Wu
 license: GPL (>= 2)
-tags: featured boost 
+tags: featured boost python
 summary: Integrate Python into R via Rcpp and Boost.Python
 ---