expression.py 文件源码

def handle_Subscript(state, node, ctx):
        state, value_result = _peval_expression(state, node.value, ctx)
        state, slice_result = _peval_expression(state, node.slice, ctx)
        if is_known_value(value_result) and is_known_value(slice_result):
            success, elem = try_call_method(
                value_result.value, '__getitem__', args=(slice_result.value,))
            if success:
                return state, KnownValue(value=elem)

        state, new_value = map_reify(state, value_result)
        state, new_slice = map_reify(state, slice_result)
        if type(new_slice) not in (ast.Index, ast.Slice, ast.ExtSlice):
            new_slice = ast.Index(value=new_slice)
        return state, replace_fields(node, value=new_value, slice=new_slice)