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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 save_plot(code, elem):
 """Converts matplotlib plots to tikz code. If elem has either the plt attribute (format: plt=width,height) or the attributes width=width and/or height=height, the figurewidth and -height are set accordingly. If none are given, a height of 4cm and a width of 6cm is used as default. Args: code: The matplotlib code. elem: The element. Returns: The code and some code to invoke matplotlib2tikz. """

    if 'plt' in elem.attributes:
        figurewidth, figureheight = elem.attributes['plt'].split(',')
    else:
        try:
            figureheight = elem.attributes['height']
        except KeyError:
            figureheight = '4cm'

        try:
            figurewidth = elem.attributes['width']
        except KeyError:
            figurewidth = '6cm'

    return f"""import matplotlib
matplotlib.use('TkAgg')
{code}
from matplotlib2tikz import get_tikz_code
tikz = get_tikz_code(figureheight='{figureheight}', figurewidth='{figurewidth}')  # noqa
print(tikz)"""