Parsing expressions problem | "ImportError: Clang is not installed, cannot parse C code"

[Audrius-St]

Hello,

I am attempting to parse C code into Python using SymPyExpression but am receiving the error message "ImportError: Clang is not installed, cannot parse C code"

However, I'm quite certain that I have Clang installed

$ conda list clang
# Name                Version         Build  Channel
clang                     13.0.1           ha770c72_0    conda-forge
clang-13               13.0.1           default_hc23dcda_0    conda-forge
libclang-cpp13     13.0.1          default_hc23dcda_0    conda-forge

Code fragment:

src_X = """

inline double advanceX(

    double const& x,

    double const& px,

    double const& y,

    double const& py,

    double const& t)

    // The C code output from FORM starts array indices at 1 not 0. Go figure.

    std::array<double, 33 + 1> w; 

    w[1]=1./3.*y;

    w[2]=139./33. + 19./2.*y;

    w[2]=w[2]*w[1];

    . . .

    double x_t=w[1] + x;

 

    return x_t;

"""

def main():

    p = SymPyExpression(src_X, 'c')

    p.convert_to_python()

    print('p:', p)

if __name__ == "__main__":

    main()

System:

Python 3.9.12

Sympy 1.10.1

VS Code 1.66.2

Ubuntu 20.04 on WSLg 1.0.33

Is there some parameter in VS Code that I need to set?
Puzzled.

Another unrelated issue. Just now, when I attempt to go to https://docs.sympy.org/
I receive the message 

404

There isn't a GitHub Pages site here.

[Aaron Meurer]

The error message should be improved there. You need clang-python.

Aaron Meurer

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[Audrius-St]

Thanks for your prompt reply.

What is "clang-python" and from where may I download it?

A search on "clang-python" did return anything obvious.

Do you mean "python3-clang-13"?

I suggest that the documentation be updated with this required information.

[Isuru Fernando]

It should be python-clang.

Isuru

To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6LzBM32J9_%3DMK0na7SZeC5VBn335u2AYJJa0x%3Dpajppgg%40mail.gmail.com.

[Audrius-St]

Okay, I found "python-clang" on conda-forge and installed it.

$ conda list python-clang

# Name                    Version                   Build  Channel

python-clang              13.0.1          default_hccd1708_0    conda-forge

I now receive the error message:

NotImplementedError: Only bool, int and float are supported

My understanding of this error message is that arrays such as std::array<double, n> are not currently supported.
Is this correct?

[Audrius-St]

Or is "double" not currently not supported?