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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 create_api_stage(restApiId, stageName, deploymentId, description='',
                     cacheClusterEnabled=False, cacheClusterSize='0.5', variables=None,
                     region=None, key=None, keyid=None, profile=None):
    '''
    Creates a new API stage for a given restApiId and deploymentId.

    CLI Example:

    .. code-block:: bash

        salt myminion boto_apigateway.create_api_stage restApiId stagename deploymentId \\
            description='' cacheClusterEnabled=True|False cacheClusterSize='0.5' variables='{"name": "value"}'

    '''
    try:
        variables = dict() if variables is None else variables

        conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
        stage = conn.create_stage(restApiId=restApiId, stageName=stageName, deploymentId=deploymentId,
                                  description=description, cacheClusterEnabled=cacheClusterEnabled,
                                  cacheClusterSize=cacheClusterSize, variables=variables)
        return {'created': True, 'stage': _convert_datetime_str(stage)}
    except ClientError as e:
        return {'created': False, 'error': __utils__['boto3.get_error'](e)}