关于 print 不换行 - V2EX
V2EX = way to explore
V2EX 是一个关于分享和探索的地方
Sign Up Now
For Existing Member  Sign In
Beautiful Soup
结巴中文分词
Green Unicorn
Sentry
Shovel
Pyflakes
pytest
Python 编程
pep8 Checker
Styles
PEP 8
Google Python Style Guide
Code Style from The Hitchhiker's Guide
hhrmatata

关于 print 不换行

  •  
  •   hhrmatata Jul 9, 2014 6631 views
    This topic created in 4313 days ago, the information mentioned may be changed or developed.
    python 2.7

    想将两次输出输出到同一行上,就在print 后面加了逗号,例如:

    import time

    print 'hehe ...',
    time.sleep(5)
    print 'finish!'

    但是有个问题,观察终端中的输出,发现观察到的程序的执行顺序是
    1. time.sleep(5)
    2. print 'hehe ...',
    3. print 'finish!'

    如何做到,先输出第一个print,再睡眠,最后输出第二个输出?两个输出在同一行。
    Supplement 1    Jul 10, 2014
    已解决。
    最后定义了这样一个函数就好了:

    def p(s):
    sys.stdout.write(s)
    sys.stdout.flush()
    return None
    14 replies    2014-07-11 01:29:58 +08:00
    cj1324
        1
    cj1324  
       Jul 9, 2014   1
    直接用import sys; sys.stdout ?
    Ansen
        3
    Ansen  
       Jul 9, 2014   1
    为啥 我这里是按顺序执行的
    hhrmatata
        4
    hhrmatata  
    OP
       Jul 9, 2014
    @cj1324
    @pinepara
    谢谢

    最后定义了这样一个函数就好了:

    def p(s):
    sys.stdout.write(s)
    sys.stdout.flush()
    return None
    cj1324
        6
    cj1324  
       Jul 9, 2014   1
    @hhrmatata
    return None 不就是 return ? 这样写反而更让人疑惑。
    wy315700
        7
    wy315700  
       Jul 9, 2014   1
    终端的输出刷新是按行来的,除非手动调用flush
    mengzhuo
        8
    mengzhuo  
       Jul 9, 2014   1
    @hhrmatata 不要观察执行顺序,ipdb是你debug的好伙伴
    shyrock
        9
    shyrock  
       Jul 9, 2014   1
    python2.7.6 执行是对的啊。。。
    hehe ... finish!
    [Finished in 5.1s]
    Ever
        10
    Ever  
       Jul 9, 2014   1
    不用return就是return None

    python3可以prnt(word, end="")

    python2.7可以from __future__ import print_function后照python3的做
    Cynic222
        11
    Cynic222  
       Jul 9, 2014   1
    @cj1324
    不写return不就是return None?这样写反而更让人疑惑。-- 开个玩笑
    cakegg
        12
    cakegg  
       Jul 9, 2014   1
    import sys
    import time
    print "hello",
    stdout_temp = sys.stdout
    time.sleep(5)
    sys.stdout = stdout_temp
    print "finish"

    其实像上面这样写就可以了...
    hhrmatata
        13
    hhrmatata  
    OP
       Jul 10, 2014 via Android
    @cj1324
    @Cynic222
    个人习惯问题,方便阅读。明确告诉阅读代码的人是返回空而不是忘记写了。
    ggarlic
        14
    ggarlic  
       Jul 11, 2014   1
    这,,,,完全不用改代码啊
    python -u xx.py
    让python运行在unbuffered的模式不就行了
    About     Help     Advertise     Blog     API     FAQ     Solana     1439 Online   Highest 6679       Select Language
    创意工作者们的社区
    World is powered by solitude
    VERSION: 3.9.8.5 45ms UTC 16:45 PVG 00:45 LAX 09:45 JFK 12:45/a>
    Do have faith in what you're doing.
    ubao msn snddm index pchome yahoo rakuten mypaper meadowduck bidyahoo youbao zxmzxm asda bnvcg cvbfg dfscv mmhjk xxddc yybgb zznbn ccubao uaitu acv GXCV ET GDG YH FG BCVB FJFH CBRE CBC GDG ET54 WRWR RWER WREW WRWER RWER SDG EW SF DSFSF fbbs ubao fhd dfg ewr dg df ewwr ewwr et ruyut utut dfg fgd gdfgt etg dfgt dfgd ert4 gd fgg wr 235 wer3 we vsdf sdf gdf ert xcv sdf rwer hfd dfg cvb rwf afb dfh jgh bmn lgh rty gfds cxv xcv xcs vdas fdf fgd cv sdf tert sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf shasha9178 shasha9178 shasha9178 shasha9178 shasha9178 liflif2 liflif2 liflif2 liflif2 liflif2 liblib3 liblib3 liblib3 liblib3 liblib3 zhazha444 zhazha444 zhazha444 zhazha444 zhazha444 dende5 dende denden denden2 denden21 fenfen9 fenf619 fen619 fenfe9 fe619 sdf sdf sdf sdf sdf zhazh90 zhazh0 zhaa50 zha90 zh590 zho zhoz zhozh zhozho zhozho2 lislis lls95 lili95 lils5 liss9 sdf0ty987 sdft876 sdft9876 sdf09876 sd0t9876 sdf0ty98 sdf0976 sdf0ty986 sdf0ty96 sdf0t76 sdf0876 df0ty98 sf0t876 sd0ty76 sdy76 sdf76 sdf0t76 sdf0ty9 sdf0ty98 sdf0ty987 sdf0ty98 sdf6676 sdf876 sd876 sd876 sdf6 sdf6 sdf9876 sdf0t sdf06 sdf0ty9776 sdf0ty9776 sdf0ty76 sdf8876 sdf0t sd6 sdf06 s688876 sd688 sdf86