pradyun / py2c Goto Github PK

A common mistake is to say C/C++ when you talk about these two languages.

Not only is this correct, it also implies that they're the same language (they're not).

For example, the sample code you've posted on the main page (the hello world program converted to C++) can't compile on C because it doesn't support the << operator (it only supports printf).

Not only that, in addition to the futures that were introduced in C++ only existing in that language (ie, classes, templates, exception handling, etc.), there's certain code that would compile on C but not on C++, like this:

int main()
    {
        double sq2 = sqrt(2);   /* Not C++: call undeclared function */
        int s = sizeof('a');    /* silent difference: 1 in C++ sizeof(int) in C */
    }

And this:

void* malloc(size_t);

void f(int n)
{
    int* p = malloc(n*sizeof(char));  /* not C++. In C++, allocate using `new' */
    char c;
    void* pv = &c;
    int* pi = pv;   /* implicit conversion of void* to int*. Not in C++ */
}

(both are taken from Stroustrup (the original designer of C++)'s website.)

Sources:

http://www.stroustrup.com/bs_faq.html#C-is-subset

http://www.stroustrup.com/bs_faq.html#C-slash

I cloned the project and build and install on setup.py.
Wondering how to proceed after this to translate a simple python file.

One of the stated goals of Py2C is to translate Python into readable C++ code, which can be done automatically by the Shedskin and Nuitka compilers. Will Py2C be compatible with either of these compilers?

Hi,

I tried to adapt codegen which is Python -> ast.AST -> Python to generate C++ in the last step. And it roughly works 😄. It is here.

Using it should look like :

import ast
import codegen_cpp

py_code = """
s = 10
s = s + 5
"""

node = ast.parse(py_code, mode='exec')
cpp_code = codegen_cpp.to_source(node)

print( py_code, "\n----------------------\n")
print(cpp_code , "\n----------------------\n")

I like the Idea behind this project, But seeing it not even pass the prototype stage even after 4 years is not good sign. So will this project ever be usable? or Did you just leave it?

doesn't compile at all

what happened

On line 26 of /py2c/translator.py it says:

from py2c.syntax_tree import python

When I attempted to run the file, it said:

>>> 
Traceback (most recent call last):
  File "C:\Users\Daniel\Desktop\Py2C-master\py2c\translator.py", line 26, in <module>
    from py2c.syntax_tree import python
ImportError: cannot import name 'python'
>>> 

It seems to be trying to import python.ast and failing. I have no idea what the proper method of loading it is, though appearently it is not import.

If anyone knows how to deal with this, I'd be happy to fix it.

Hello ,
May I learn please how it works ? and thank you !

Hi there,
As one of many guys out there who loves python and would appreciate an automated way to transform prototyped python code into readable C++ I must say this project is far from usable. And at this stage you should ask yourself, is it worth the troubles in the long run?

The goal seems to be a conversion which does not facilitate the Python API in any way to be as fast as possible and creates readable code.

Both Shed Skin and Nuitka create C++ code. The former in a almost readable form (quite close to python code with many library calls and defines) but with some restrictions, while the latter is CPython feature complete and has ambitions for speed ups.

IMO, Shed Skin is amazing and the readability might improve in future versions.
Nuitka on the other hand takes the performance path, which is already well served with Cython and JITs. I say only humans are able to to write code that is readable and high(est) performance at the same time. So better join up with Shed Skin, or Nuitka.

Hi,
when I try to convert python code to c on windows with python file placed in same location where py2c.sh exists. I get an error running the following command

py2c -o file Encoder.py --keep
error

'py2c' is not recognized as an internal or external command,
operable program or batch file.

I get same error even if I run
py2c.sh -o file Encoder.py --keep

I don't know how to actually USE Py2C to convert Python into C/C++. What specific function do you use in the py2c folder to convert the code?

This is a meta-issue for tracking the progress of the project till it's first public release.
I'll keep posting updates here.

• Make a clear plan of Action for the project. (Replace this list)
• Create a (high-level) list for things to be done. Add items to it when you get to an item.

Hi,

Would you please tell me how can I run Py2C after install? I couldn't find anything that could help me with this.

I'd happy to make an online demo for Py2C if you like.

I would like to guide some students to contribute to this project and would like to get your inputs on the priorities you might have.

Thanks!