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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_entity_info(pdb_id):
 """Return pdb id information Parameters pdb_id : string A 4 character string giving a pdb entry of interest Returns ------- out : dict A dictionary containing a description the entry Examples -------- {'Entity': {'@id': '1', '@type': 'protein', 'Chain': [{'@id': 'A'}, {'@id': 'B'}]}, 'Method': {'@name': 'xray'}, 'bioAssemblies': '1', 'release_date': 'Wed Aug 14 00:00:00 PDT 2013', 'resolution': '1.84', 'structureId': '4lza'} """

    out = get_info(pdb_id, url_root = 'http://www.rcsb.org/pdb/rest/getEntityInfo?structureId=')
    out = to_dict(out)
    return remove_at_sign( out['entityInfo']['PDB'] )