py_eval

Evaluate a single Python expression, in a way analogous to the Python
<code><a href="/link/eval()?package=reticulate&version=1.37.0" data-mini-rdoc="reticulate::eval()">eval()</a></code> built-in function.

Interface to 'Python' modules, classes, and functions. When calling
into 'Python', R data types are automatically converted to their equivalent 'Python'
types. When values are returned from 'Python' to R they are converted back to R
types. Compatible with all versions of 'Python' >= 2.7.

Tomasz Kalinowski

reticulate

Interface to 'Python'

Kevin Ushey

JJ Allaire

RStudio 

Yuan Tang

Dirk Eddelbuettel

Bryan Lewis

Sigrid Keydana

Ryan Hafen

Marcus Geelnard

py_eval function

<dl><dt>code</dt>
<dd>A single Python expression.</dd>
<dt>convert</dt>
<dd>Boolean; automatically convert Python objects to R?</dd></dl>

Arguments

<code>py_eval()</code> only supports evaluation of 'simple' Python expressions.
Other expressions (e.g. assignments) will fail; e.g.
<div class="sourceCode"></div><pre><code>&gt; py_eval("x = 1")
Error in py_eval_impl(code, convert) :
 SyntaxError: invalid syntax (reticulate_eval, line 1)
</code></pre>
and this mirrors what one would see in a regular Python interpreter:
<div class="sourceCode"></div><pre><code>&gt;&gt;&gt; eval("x = 1")
Traceback (most recent call last):
 File "&lt;stdin&gt;", line 1, in &lt;module&gt;
 File "&lt;string&gt;", line 1
x = 1
^
 SyntaxError: invalid syntax
</code></pre>
The <code>py_run_string()</code> method can be used if the evaluation of arbitrary
Python code is required.

Caveats

Evaluate a single Python expression, in a way analogous to the Python
<code><a href='https://rdrr.io/r/base/eval.html'>eval()</a></code> built-in function.

Evaluate a Python Expression — py_eval

<dl>

<dt>code</dt>
<dd>A single Python expression.</dd>


<dt>convert</dt>
<dd>Boolean; automatically convert Python objects to R?</dd>

</dl>

<code>py_eval()</code> only supports evaluation of 'simple' Python expressions.
Other expressions (e.g. assignments) will fail; e.g.
<div class="sourceCode"><pre><code>&gt; py_eval("x = 1")
Error in py_eval_impl(code, convert) :
 SyntaxError: invalid syntax (reticulate_eval, line 1)
</code></pre></div>
and this mirrors what one would see in a regular Python interpreter:
<div class="sourceCode"><pre><code>&gt;&gt;&gt; eval("x = 1")
Traceback (most recent call last):
 File "&lt;stdin&gt;", line 1, in &lt;module&gt;
 File "&lt;string&gt;", line 1
x = 1
^
 SyntaxError: invalid syntax
</code></pre></div>
The <code>py_run_string()</code> method can be used if the evaluation of arbitrary
Python code is required.

py_eval: Evaluate a Python Expression

Description

Usage

Value

Arguments

Caveats