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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 get_nested_plot_frame(obj, key_map, cached=False):
 """Extracts a single frame from a nested object. Replaces any HoloMap or DynamicMap in the nested data structure, with the item corresponding to the supplied key. Args: obj: Nested Dimensioned object key_map: Dictionary mapping between dimensions and key value cached: Whether to allow looking up key in cache Returns: Nested datastructure where maps are replaced with single frames """

    clone = obj.map(lambda x: x)

    # Ensure that DynamicMaps in the cloned frame have
    # identical callback inputs to allow memoization to work
    for it1, it2 in zip(obj.traverse(lambda x: x), clone.traverse(lambda x: x)):
        if isinstance(it1, DynamicMap):
            with disable_constant(it2.callback):
                it2.callback.inputs = it1.callback.inputs
    with item_check(False):
        return clone.map(lambda x: get_plot_frame(x, key_map, cached=cached),
                         [DynamicMap, HoloMap], clone=False)