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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 expand_with_style(template, style, data, body_subtree='body'):
 """Expand a data dictionary with a template AND a style. DEPRECATED -- Remove this entire function in favor of expand(d, style=style) A style is a Template instance that factors out the common strings in several "body" templates. Args: template: Template instance for the inner "page content" style: Template instance for the outer "page style" data: Data dictionary, with a 'body' key (or body_subtree """

    if template.has_defines:
        return template.expand(data, style=style)
    else:
        tokens = []
        execute_with_style_LEGACY(template, style, data, tokens.append,
                                  body_subtree=body_subtree)
        return JoinTokens(tokens)