How to use the cffi.recompiler.recompile function in cffi

def _verify(ffi, module_name, preamble, *args, **kwds):
    import imp
    from cffi.recompiler import recompile
    from .udir import udir
    assert module_name not in sys.modules, "module name conflict: %r" % (
        module_name,)
    kwds.setdefault('tmpdir', str(udir))
    outputfilename = recompile(ffi, module_name, preamble, *args, **kwds)
    module = imp.load_dynamic(module_name, outputfilename)
    #
    # hack hack hack: copy all *bound methods* from module.ffi back to the
    # ffi instance.  Then calls like ffi.new() will invoke module.ffi.new().
    for name in dir(module.ffi):
        if not name.startswith('_'):
            attr = getattr(module.ffi, name)
            if attr is not getattr(ffi, name, object()):
                setattr(ffi, name, attr)
    def typeof_disabled(*args, **kwds):
        raise NotImplementedError
    ffi._typeof = typeof_disabled
    for name in dir(ffi):
        if not name.startswith('_') and not hasattr(module.ffi, name):
            setattr(ffi, name, NotImplemented)
    return module.lib

def test_module_name_in_package():
    ffi = FFI()
    ffi.cdef("int foo(int);")
    recompiler.recompile(ffi, "test_module_name_in_package.mymod",
                         "int foo(int x) { return x + 32; }",
                         tmpdir=str(udir))
    old_sys_path = sys.path[:]
    try:
        package_dir = udir.join('test_module_name_in_package')
        for name in os.listdir(str(udir)):
            assert not name.startswith('test_module_name_in_package.')
        assert os.path.isdir(str(package_dir))
        assert len(os.listdir(str(package_dir))) > 0
        assert os.path.exists(str(package_dir.join('mymod.c')))
        package_dir.join('__init__.py').write('')
        #
        getattr(importlib, 'invalidate_caches', object)()
        #
        sys.path.insert(0, str(udir))
        import test_module_name_in_package.mymod

def _verify(ffi, module_name, preamble, *args, **kwds):
    import imp
    from cffi.recompiler import recompile
    from .udir import udir
    assert module_name not in sys.modules, "module name conflict: %r" % (
        module_name,)
    kwds.setdefault('tmpdir', str(udir))
    outputfilename = recompile(ffi, module_name, preamble, *args, **kwds)
    module = imp.load_dynamic(module_name, outputfilename)
    #
    # hack hack hack: copy all *bound methods* from module.ffi back to the
    # ffi instance.  Then calls like ffi.new() will invoke module.ffi.new().
    for name in dir(module.ffi):
        if not name.startswith('_'):
            attr = getattr(module.ffi, name)
            if attr is not getattr(ffi, name, object()):
                setattr(ffi, name, attr)
    def typeof_disabled(*args, **kwds):
        raise NotImplementedError
    ffi._typeof = typeof_disabled
    for name in dir(ffi):
        if not name.startswith('_') and not hasattr(module.ffi, name):
            setattr(ffi, name, NotImplemented)
    return module.lib

def test_module_name_in_package():
    ffi = FFI()
    ffi.cdef("int foo(int);")
    recompiler.recompile(ffi, "test_module_name_in_package.mymod",
                         "int foo(int x) { return x + 32; }",
                         tmpdir=str(udir))
    old_sys_path = sys.path[:]
    try:
        package_dir = udir.join('test_module_name_in_package')
        for name in os.listdir(str(udir)):
            assert not name.startswith('test_module_name_in_package.')
        assert os.path.isdir(str(package_dir))
        assert len(os.listdir(str(package_dir))) > 0
        assert os.path.exists(str(package_dir.join('mymod.c')))
        package_dir.join('__init__.py').write('')
        #
        getattr(importlib, 'invalidate_caches', object)()
        #
        sys.path.insert(0, str(udir))
        import test_module_name_in_package.mymod

def test_module_name_in_package():
    ffi = FFI()
    ffi.cdef("int foo(int);")
    recompiler.recompile(ffi, "test_module_name_in_package.mymod",
                         "int foo(int x) { return x + 32; }",
                         tmpdir=str(udir))
    old_sys_path = sys.path[:]
    try:
        package_dir = udir.join('test_module_name_in_package')
        for name in os.listdir(str(udir)):
            assert not name.startswith('test_module_name_in_package.')
        assert os.path.isdir(str(package_dir))
        assert len(os.listdir(str(package_dir))) > 0
        assert os.path.exists(str(package_dir.join('mymod.c')))
        package_dir.join('__init__.py').write('')
        #
        getattr(importlib, 'invalidate_caches', object)()
        #
        sys.path.insert(0, str(udir))
        import test_module_name_in_package.mymod