求助, 关于 Python print 的一个小小小小小问题. - V2EX
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Ahagotyou

求助, 关于 Python print 的一个小小小小小问题.

  •  1
     
  •   Ahagotyou May 24, 2019 2589 views
    This topic created in 2530 days ago, the information mentioned may be changed or developed.

    def p(): print("我是小米", end="\r") print("我是小米的哥哥大米", end="\r") print("我是雷布斯", end="\r")

    output: 我是雷布斯哥哥大米

    如何最后只显示 我是雷布斯. 这个函数效果是: 结果全部只显示在一行且以新输出覆盖旧输出, 问题是只是覆盖, 不会清除旧输出, 导致很尴尬.

    感谢了~

    11 replies    2019-05-25 15:14:32 +08:00
    Ahagotyou
        1
    Ahagotyou  
    OP
       May 24, 2019
    ```
    print("服")
    ```
    lance6716
        2
    lance6716  
       May 24, 2019
    只用 print 做不到,需要调终端接口吧
    leoleoasd
        3
    leoleoasd  
       May 24, 2019 via Android
    可以打印退格键
    weyou
        4
    weyou  
       May 24, 2019 via Android   1
    这个问题跟语言无关。 这次打印的内容比上一次短的话,在后面补空格到相同的长度来覆盖上一次的打印就行了
    baobao1270
        5
    baobao1270  
       May 24, 2019
    每一次输出之前,输出一堆空格,先覆盖掉不久行了
    另外,建议用 format 函数统一输出长度
    cissoid
        6
    cissoid  
       May 24, 2019
    用 escape code

    print("\x1B[K 我是小米的哥哥大米", end="\r")
    lrxiao
        7
    lrxiao  
       May 24, 2019
    写一个 context manager hook 掉 sys.stdout 然后自己搞
    nondanee
        8
    nondanee  
       May 24, 2019
    "\r\033[K"
    Qzier
        9
    Qzier  
       May 25, 2019 via iPhone
    你需要用先清空标准输出,代码如下:
    Qzier
        10
    Qzier  
       May 25, 2019 via iPhone
    import sys
    from time import sleep

    messages = [
    '我是雷军',
    '我是小米',
    '我是大米'
    ]

    while True:
    for msg in messages:
    sys.stdout.flush()
    sys.stdout.write(f'\r{msg}')
    sleep(0.5)
    qcts33
        11
    qcts33  
       May 25, 2019
    你需要将终端想象成一个打字机,而\r 的作用只是把打字的位置强行拉回行首,并不会刷新原有输出,所以新的输出只是覆盖原有输出而已,没有被覆盖到的地方还是保留原状
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