How can I call built-in functions in Python using Boost.Python

Question

I know we can import modules and just embed Python code in C++ and evaluate it. But how can I use built-in functions like print or open? These functions off course aren't module. Evaluating embedded open statement just gives me the following error:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name 'open' is not defined

Stuck. Please help me.

you can import builtins, no idea if this help though...

Chris_Rands
– Chris_Rands

2018-11-02 11:21:31 +00:00
Commented Nov 2, 2018 at 11:21 — Chris_Rands
– Chris_Rands, Commented Nov 2, 2018 at 11:21

Albin Paul · Accepted Answer · 2018-11-02 11:34:09Z

1

Try importing the builtins and io module and if you want any other function just call the __module__ attribute to find about which module to import

>>> print.__module__
'builtins'
>>> open.__module__
'io'

answered Nov 2, 2018 at 11:34

Albin Paul

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5 Comments

scipsycho Over a year ago

Are you sure? how will open.__module__ work if it is showing a NameError.

Albin Paul Over a year ago

@scipsycho i dont get it where it is showing a name error? and i used python3 for this

scipsycho Over a year ago

You are correct @AlbinPaul but all I was saying is that the guy who asked this question is having a NameError, so how will he be able to run open.__module__

Albin Paul Over a year ago

@scipsycho ok the function open is defined in the module io in python3 and builtin in python2 which are imported by default in a program so to avoide the name error in c++ the OP must import the builtin module or io module to get it running

Marronnier Over a year ago

Thanks @AlbinPaul! In my environment, open seems to live in __builtin__, though. Anyway, by importing __builtin__ module, my problem has been resolved.

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