R: Evaluate a Python Expression

py_eval {reticulate} | R Documentation

## Evaluate a Python Expression

### Description

Evaluate a single Python expression, in a way analogous to the Python `eval()` built-in function.

### Usage

    py_eval(code, convert = TRUE)

### Arguments

`code` | A single Python expression.
`convert` | Boolean; automatically convert Python objects to R?

### Value

The result produced by evaluating `code`, converted to an `R` object when `convert` is set to `TRUE`.

### Caveats

`py_eval()` only supports evaluation of 'simple' Python expressions. Other expressions (e.g. assignments) will fail; e.g.

    > py_eval("x = 1")
    Error in py_eval_impl(code, convert) :
      SyntaxError: invalid syntax (reticulate_eval, line 1)

and this mirrors what one would see in a regular Python interpreter:

    >>> eval("x = 1")
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "<string>", line 1
    x = 1
    ^
      SyntaxError: invalid syntax

The `py_run_string()` method can be used if the evaluation of arbitrary Python code is required.

[Package reticulate version 1.23 Index]