Using built-in "open" python method in pybind11 (C++)?

Question

How do you use basic ("default"/"built-in"; don't need to be imported) python methods in pybind11?

Lists, dictionaries, and some others do have built-in compatibility, but the method I am looking specifically for (open) is not included via an import. I know that a way around it would be to create a python file with a method wrapping "open" and then calling it as you would any imported method, but I would prefer to do it directly in C++ (using pybind) if possible as otherwise that semi-defeats the purpose.

Any assistance/advice would be greatly appreciated.

I've been looking for same functionallity. Unfortunately it seems like one should implement it by himself. github.com/pybind/pybind11/blob/master/include/pybind11/… looks like is a good point to start — Sergei
– Sergei, Commented Apr 23, 2018 at 8:17

Roman Miroshnychenko · Accepted Answer · 2018-04-27 21:00:57Z

4

You are wrong. First, built-in names are importable from builtins module (in Python 3):

py::object open = py::module::import("builtins").attr("open");

Second, open also lives in io module so you can also use the following line that is equivalent to the line above:

py::object open = py::module::import("io").attr("open");

This is for Python 3, but the last line works for Python 2.7 too.

answered Apr 27, 2018 at 21:00

Roman Miroshnychenko

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2 Comments

user2357112 Over a year ago

The builtin open has a different signature from io.open on Python 2, though.

Markyroson Over a year ago

Oh, okay. Thank you! :D

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