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How to use _extract_const method in autotest

Best Python code snippet using autotest_python

control_data.py

Source:control_data.py

...153        # Add subsystem:default if subsystem is not specified.154        self._set_set('attributes', val)155        if not any(a.startswith('subsystem') for a in self.attributes):156            self.attributes.add('subsystem:default')157def _extract_const(expr):158    assert(expr.__class__ == compiler.ast.Const)159    assert(expr.value.__class__ in (str, int, float, unicode))160    return str(expr.value).strip()161def _extract_dict(expr):162    assert(expr.__class__ == compiler.ast.Dict)163    assert(expr.items.__class__ == list)164    cf_dict = {}165    for key, value in expr.items:166        try:167            key = _extract_const(key)168            val = _extract_expression(value)169        except (AssertionError, ValueError):170            pass171        else:172            cf_dict[key] = val173    return cf_dict174def _extract_list(expr):175    assert(expr.__class__ == compiler.ast.List)176    list_values = []177    for value in expr.nodes:178        try:179            list_values.append(_extract_expression(value))180        except (AssertionError, ValueError):181            pass182    return list_values183def _extract_name(expr):184    assert(expr.__class__ == compiler.ast.Name)185    assert(expr.name in ('False', 'True', 'None'))186    return str(expr.name)187def _extract_expression(expr):188    if expr.__class__ == compiler.ast.Const:189        return _extract_const(expr)190    if expr.__class__ == compiler.ast.Name:191        return _extract_name(expr)192    if expr.__class__ == compiler.ast.Dict:193        return _extract_dict(expr)194    if expr.__class__ == compiler.ast.List:195        return _extract_list(expr)196    raise ValueError('Unknown rval %s' % expr)197def _extract_assignment(n):198    assert(n.__class__ == compiler.ast.Assign)199    assert(n.nodes.__class__ == list)200    assert(len(n.nodes) == 1)201    assert(n.nodes[0].__class__ == compiler.ast.AssName)202    assert(n.nodes[0].flags.__class__ == str)203    assert(n.nodes[0].name.__class__ == str)...

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