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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 update(dst, src):
 """ Recursively update values in dst from src. Unlike the builtin dict.update() function, this method will decend into nested dicts, updating all nested values. Arguments: dst (dict):
 Destination dict. src (dict):
 Source dict. Returns: dict: dst updated with entries from src. """

    for k, v in src.items():
        if isinstance(v, Mapping):
            r = update(dst.get(k, {}), v)
            dst[k] = r
        else:
            dst[k] = src[k]
    return dst