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    <p>Do you mean something like this?</p> <pre><code>export NUM=10 R -q -e "rnorm($NUM)" </code></pre> <p>You might also like to check out <code>littler</code> - <a href="http://dirk.eddelbuettel.com/code/littler.html">http://dirk.eddelbuettel.com/code/littler.html</a></p> <p><strong>UPDATED</strong></p> <p>Following your comment below, I think I am beginning to understand your question better. You are asking about running python inside the R shell.</p> <p>So here's an example:-</p> <pre><code># code in a file named myfirstpythonfile.py a = 1 b = 19 c = 3 mylist = [a, b, c] for item in mylist: print item </code></pre> <p>In your R shell, therefore, do this:</p> <pre><code>&gt; system('python myfirstpythonfile.py') 1 19 3 </code></pre> <p>Essentially, you can simply call <code>python /path/to/your/python/file.py</code> to execute a block of python code.</p> <p>In my case, I can simply call <code>python myfirstpythonfile.py</code> assuming that I launched my R shell in the same directory (path) my python file resides.</p> <p><strong>FURTHER UPDATED</strong></p> <p>And if you <em>really</em> want to print out the source code, here's a brute force method that might be possible. In your R shell:-</p> <pre><code>&gt; system('python -c "import sys; sys.stdout.write(file(\'myfirstpythonfile.py\', \'r\').read());"; python myfirstpythonfile.py') a = 1 b = 19 c = 3 mylist = [a, b, c] for item in mylist: print item 1 19 3 </code></pre> <p><strong>AND FURTHER FURTHER UPDATED :-)</strong></p> <p>So if the purpose is to print the python code before the execution of a code, we can use the python trace module (reference: <a href="http://docs.python.org/library/trace.html">http://docs.python.org/library/trace.html</a>). In command line, we use the <code>-m</code> option to call a python module and we specify the options for that python module following it.</p> <p>So for my example above, it would be:-</p> <pre><code>$ python -m trace --trace myfirstpythonfile.py --- modulename: myfirstpythonfile, funcname: &lt;module&gt; myfirstpythonfile.py(1): a = 1 myfirstpythonfile.py(2): b = 19 myfirstpythonfile.py(3): c = 3 myfirstpythonfile.py(4): mylist = [a, b, c] myfirstpythonfile.py(5): for item in mylist: myfirstpythonfile.py(6): print item 1 myfirstpythonfile.py(5): for item in mylist: myfirstpythonfile.py(6): print item 19 myfirstpythonfile.py(5): for item in mylist: myfirstpythonfile.py(6): print item 3 myfirstpythonfile.py(5): for item in mylist: --- modulename: trace, funcname: _unsettrace trace.py(80): sys.settrace(None) </code></pre> <p>Which as we can see, traces the exact line of python code, executes the result immediately after and outputs it into stdout.</p>
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    1. POcall python with system() in R to run a python script emulating the python console
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    1. CONo, I'm primarily asking a way to run python scripts like the way we call `source(file, echo=TRUE)` in R. It looks like the `code` module in python may help (read-eval-print loops), but I'm wondering if python has such a function that can be called directly. I'm new to python. Thanks!
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    2. COYou simply run python scripts (block of python code in a python file) in the command line by calling "python thefilename". So your `system()` call in R shell should do the same. I have updated my answer above.
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    3. COYes, but the question was also, how to print the python-code before execution. Is there some flag for python, like `-x` for bash scripts?
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