$$ \newcommand{\uex}{{u_{\small\mbox{e}}}} \newcommand{\half}{\frac{1}{2}} \newcommand{\halfi}{{1/2}} \newcommand{\xpoint}{\boldsymbol{x}} \newcommand{\normalvec}{\boldsymbol{n}} \newcommand{\Oof}[1]{\mathcal{O}(#1)} \newcommand{\Ix}{\mathcal{I}_x} \newcommand{\Iy}{\mathcal{I}_y} \newcommand{\It}{\mathcal{I}_t} \newcommand{\setb}[1]{#1^0} % set begin \newcommand{\sete}[1]{#1^{-1}} % set end \newcommand{\setl}[1]{#1^-} \newcommand{\setr}[1]{#1^+} \newcommand{\seti}[1]{#1^i} \newcommand{\Real}{\mathbb{R}} $$

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Building the extension module

Generate Fortran 90 module (wave2D_u0_loop_c_f2py.pyf): 

Terminal> f2py -m wave2D_u0_loop_c_f2py \ 
          -h wave2D_u0_loop_c_f2py.pyf --overwrite-signature \ 
          wave2D_u0_loop_c_f2py_signature.f

The compile and build step must list the C files: 

Terminal> f2py -c wave2D_u0_loop_c_f2py.pyf \ 
          --build-dir tmp_build_c \ 
          -DF2PY_REPORT_ON_ARRAY_COPY=1 wave2D_u0_loop_c.c

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