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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 descriptors(package):
 """Returns a dictionary of descriptors deserialized from JSON for the specified package. Args: package (str):
 name of the python package to get settings for. """

    from os import path
    dpath = _descriptor_path(package)
    if path.isfile(dpath):
        import json
        with open(dpath) as f:
            jdb = json.load(f)
        return jdb
    else:
        return None