diagnose.py 文件源码

def check_executable(executable):
    """
    Checks if an executable exists in $PATH.

    Arguments:
        executable -- the name of the executable (e.g. "echo")

    Returns:
        True or False
    """
    logger = logging.getLogger(__name__)
    logger.debug("Checking executable '%s'...", executable)
    executable_path = find_executable(executable)
    found = executable_path is not None
    if found:
        logger.debug("Executable '%s' found: '%s'", executable,
                     executable_path)
    else:
        logger.debug("Executable '%s' not found", executable)
    return found