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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _bracket_dim_suggest(self, variable):
 """Returns a dictionary of documentation for helping complete the dimensions of a variable."""

        if variable is not None:
            #Look for <dimension> descriptors that are children of the variable
            #in its docstrings.
            dims = variable.doc_children("dimension", ["member", "parameter", "local"])
            descript = str(variable)
            if len(dims) > 0:
                descript += " | " + " ".join([DocElement.format_dimension(d) for d in dims])

            return dict(
                params=[variable.dimension],
                index=0,
                call_name=variable.name,
                description=descript,
            )        
        else:
            return []