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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_certs(context=_DEFAULT_CONTEXT, store=_DEFAULT_STORE):
    '''
    Get the available certificates in the given store.

    :param str context: The name of the certificate store location context.
    :param str store: The name of the certificate store.

    :return: A dictionary of the certificate thumbprints and properties.
    :rtype: dict

    CLI Example:

    .. code-block:: bash

        salt '*' win_pki.get_certs
    '''
    ret = dict()
    cmd = list()
    blacklist_keys = ['DnsNameList']
    store_path = r'Cert:\{0}\{1}'.format(context, store)

    _validate_cert_path(name=store_path)

    cmd.append(r"Get-ChildItem -Path '{0}' | Select-Object".format(store_path))
    cmd.append(' DnsNameList, SerialNumber, Subject, Thumbprint, Version')

    items = _cmd_run(cmd=six.text_type().join(cmd), as_json=True)

    for item in items:
        cert_info = dict()
        for key in item:
            if key not in blacklist_keys:
                cert_info[key.lower()] = item[key]

        names = item.get('DnsNameList', None)
        if isinstance(names, list):
            cert_info['dnsnames'] = [name.get('Unicode') for name in names]
        else:
            cert_info['dnsnames'] = []
        ret[item['Thumbprint']] = cert_info
    return ret