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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_role(name, policy_document=None, path=None, region=None, key=None,
                keyid=None, profile=None):
    '''
    Create an instance role.

    CLI Example:

    .. code-block:: bash

        salt myminion boto_iam.create_role myrole
    '''
    conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)

    if role_exists(name, region, key, keyid, profile):
        return True
    if not policy_document:
        policy_document = None
    try:
        conn.create_role(name, assume_role_policy_document=policy_document,
                         path=path)
        log.info('Created IAM role %s.', name)
        return True
    except boto.exception.BotoServerError as e:
        log.error(e)
        log.error('Failed to create IAM role %s.', name)
        return False