python/mxnet/ndarray.py [2364:2418]:
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    real_name = ctypes.c_char_p()
    desc = ctypes.c_char_p()
    num_args = mx_uint()
    arg_names = ctypes.POINTER(ctypes.c_char_p)()
    arg_types = ctypes.POINTER(ctypes.c_char_p)()
    arg_descs = ctypes.POINTER(ctypes.c_char_p)()
    key_var_num_args = ctypes.c_char_p()
    ret_type = ctypes.c_char_p()

    check_call(_LIB.MXSymbolGetAtomicSymbolInfo(
        handle, ctypes.byref(real_name), ctypes.byref(desc),
        ctypes.byref(num_args),
        ctypes.byref(arg_names),
        ctypes.byref(arg_types),
        ctypes.byref(arg_descs),
        ctypes.byref(key_var_num_args),
        ctypes.byref(ret_type)))
    narg = int(num_args.value)
    arg_names = [py_str(arg_names[i]) for i in range(narg)]
    arg_types = [py_str(arg_types[i]) for i in range(narg)]
    func_name = name
    key_var_num_args = py_str(key_var_num_args.value)
    ret_type = py_str(ret_type.value) if ret_type.value is not None else ''
    doc_str = _build_doc(func_name,
                         py_str(desc.value),
                         arg_names,
                         arg_types,
                         [py_str(arg_descs[i]) for i in range(narg)],
                         key_var_num_args,
                         ret_type)

    dtype_name = None
    arr_name = None
    ndsignature = []
    signature = []
    ndarg_names = []
    kwarg_names = []
    for i in range(narg):
        name, atype = arg_names[i], arg_types[i]
        if name == 'dtype':
            dtype_name = name
            signature.append('%s=_Null'%name)
        elif atype.startswith('NDArray') or atype.startswith('Symbol'):
            assert not arr_name, \
                "Op can only have one argument with variable " \
                "size and it must be the last argument."
            if atype.endswith('[]'):
                ndsignature.append('*%s'%name)
                arr_name = name
            else:
                ndsignature.append('%s=None'%name)
                ndarg_names.append(name)
        else:
            signature.append('%s=_Null'%name)
            kwarg_names.append(name)
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python/mxnet/symbol.py [2107:2161]:
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    real_name = ctypes.c_char_p()
    desc = ctypes.c_char_p()
    num_args = mx_uint()
    arg_names = ctypes.POINTER(ctypes.c_char_p)()
    arg_types = ctypes.POINTER(ctypes.c_char_p)()
    arg_descs = ctypes.POINTER(ctypes.c_char_p)()
    key_var_num_args = ctypes.c_char_p()
    ret_type = ctypes.c_char_p()

    check_call(_LIB.MXSymbolGetAtomicSymbolInfo(
        handle, ctypes.byref(real_name), ctypes.byref(desc),
        ctypes.byref(num_args),
        ctypes.byref(arg_names),
        ctypes.byref(arg_types),
        ctypes.byref(arg_descs),
        ctypes.byref(key_var_num_args),
        ctypes.byref(ret_type)))
    narg = int(num_args.value)
    arg_names = [py_str(arg_names[i]) for i in range(narg)]
    arg_types = [py_str(arg_types[i]) for i in range(narg)]
    func_name = name
    key_var_num_args = py_str(key_var_num_args.value)
    ret_type = py_str(ret_type.value) if ret_type.value is not None else ''
    doc_str = _build_doc(func_name,
                         py_str(desc.value),
                         arg_names,
                         arg_types,
                         [py_str(arg_descs[i]) for i in range(narg)],
                         key_var_num_args,
                         ret_type)

    dtype_name = None
    arr_name = None
    ndsignature = []
    signature = []
    ndarg_names = []
    kwarg_names = []
    for i in range(narg):
        name, atype = arg_names[i], arg_types[i]
        if name == 'dtype':
            dtype_name = name
            signature.append('%s=_Null'%name)
        elif atype.startswith('NDArray') or atype.startswith('Symbol'):
            assert not arr_name, \
                "Op can only have one argument with variable " \
                "size and it must be the last argument."
            if atype.endswith('[]'):
                ndsignature.append('*%s'%name)
                arr_name = name
            else:
                ndsignature.append('%s=None'%name)
                ndarg_names.append(name)
        else:
            signature.append('%s=_Null'%name)
            kwarg_names.append(name)
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