generic.py 文件源码

def touch(fname, mode=0o666, dir_fd=None, **kwargs):
    ## After http://stackoverflow.com/questions/1158076/implement-touch-using-python
    if sys.version_info < (3, 3, 0):
        with open(fname, 'a'):
            os.utime(fname, None) # set to now
    else:
        flags = os.O_CREAT | os.O_APPEND
        with os.fdopen(os.open(fname, flags=flags, mode=mode, dir_fd=dir_fd)) as f:
            os.utime(f.fileno() if os.utime in os.supports_fd else fname,
                     dir_fd=None if os.supports_fd else dir_fd, **kwargs)