<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_bin_version_str(bin_path, version_flag='-v', kw={}):
 """ Get the version string through the binary. """


    try:
        prog = _get_exec_binary(bin_path, kw)
        version_str = version_expr.search(
            check_output([prog, version_flag], **kw).decode(locale)
        ).groups()[0]
    except OSError:
        logger.warning("failed to execute '%s'", bin_path)
        return None
    except Exception:
        logger.exception(
            "encountered unexpected error while trying to find version of "
            "'%s':", bin_path
        )
        return None
    logger.info("'%s' is version '%s'", bin_path, version_str)
    return version_str