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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 describe_alias(FunctionName, Name, region=None, key=None,
                   keyid=None, profile=None):
    '''
    Given a function name and alias name describe the properties of the alias.

    Returns a dictionary of interesting properties.

    CLI Example:

    .. code-block:: bash

        salt myminion boto_lambda.describe_alias myalias

    '''

    try:
        alias = _find_alias(FunctionName, Name,
                            region=region, key=key, keyid=keyid, profile=profile)
        if alias:
            keys = ('AliasArn', 'Name', 'FunctionVersion', 'Description')
            return {'alias': dict([(k, alias.get(k)) for k in keys])}
        else:
            return {'alias': None}
    except ClientError as e:
        return {'error': __utils__['boto3.get_error'](e)}