python embedding in C : define the python script as a C string?

Question

I would like to invoke the following python script in C :

#!/usr/bin/python2.7

import parser

def evaluate(text):
   code = parser.expr(text).compile()
   return eval(code)

as explained in the following page https://docs.python.org/2/extending/embedding.html, i can call this script from C using the pwd(path) of the file.

However, i would like to know if it's possible to not load the script by calling python on a C string directly, defining the script.

For example, i would like to let's say i put :

#define PYTHON_SCRIPT ((char*)(\      
  import parser\  
  \                    
  def evaluate(text):\   
    code = parser.expr(text).compile()\  
    return eval(code)\ 
  ))

is it possible to call the python interpreter directly on that string?

Indeed, knowing that i need to pass text as a variable, i can't use this Pyrun_SimpleString function, and i was not able to find something to answer this question.

There is no PyRun_FromString function in the Python-C-API. Do you mean PyRun_SimpleString? Why can't you use it? It is one possible way to execute Python in C. — HelloWorld
– HelloWorld, Commented Sep 14, 2015 at 9:00
ah yes indeed, i correct it. The problem with PyRun_SimpleString is that it seems to not take variables as arguments... — evoliptic
– evoliptic, Commented Sep 14, 2015 at 9:09

HelloWorld · Accepted Answer · 2015-09-14 09:29:33Z

2

As mentioned in the comment there is no Pyrun_SimpleString. How to execute Python functions from C is covered here. One way to do it:

Compile your script using Py_CompileString
Create a dictionary for globals/locals.
Extract the function from your globals dict by using PyDict_GetItemString(name)
Build your arguments tuple with PyArg_ParseTuple
Execute your function object by using PyObject_CallFunction.

edited Sep 14, 2015 at 9:29

answered Sep 14, 2015 at 9:15

HelloWorld

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1 Comment

evoliptic Over a year ago

thanks i was able to do what i wanted using your answer

hellpanderr · Accepted Answer · 2015-09-14 09:09:50Z

1

Take a look at Weave, it allows you to include C code directly in Python code.

answered Sep 14, 2015 at 9:09

hellpanderr

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1 Comment

evoliptic Over a year ago

thank you, but i want to do the opposite : calling python within C ^^

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