管道像perl | MYPIPE

本文介绍了管道像perl的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！问题描述嗨。 in perl我可以这样做： .... if（打开（MYPIPE，" * some_system_command * |"）） { ... * do_something * ... while（$ answer =< MYPIPE>） { print $ answer; } ... * do_something_more * ... } 其他 { ... * do_something_else * ... } .... 但我不知道如何在python中执行此操作，因为if * command *： "给出了语法错误。此外，如果我使用 .... 导入os .... 尝试： MYPIPE = os.popen（" * some_system_command *，" r" ;） ... * do_something * ... 回答MYPIPE：打印答案， MYPIPE.close（） ... * do_something_more * ... 除外： ... * do_something_else * ... .... 它不起作用，因为* do_something *和* do_something_more *是总是被执行（好像是 MYPIPE = os.popen（" * some_system_command *"，" r"）即使* some_system_command *没有，也不会引发任何异常存在/工作...... 任何帮助？非常感谢 max 解决方案 answer =< MYPIPE>） { print answer; } ... * do_something_more * ... } else { ... * do_something_else * ... } .... 但我不知道如何在python中执行此操作，因为if * command *：给出了语法错误。此外，如果我使用 .... 导入os .... 尝试： MYPIPE = os.popen（" * some_system_command *，" r" ;） ... * do_something * ... 回答MYPIPE：打印答案， MYPIPE.close（） ... * do_something_more * ... 除外： ... * do_something_else * ... .... 它不起作用，因为* do_something *和* do_something_more *是总是被执行（好像是 MYPIPE = os.popen（" * some_system_command *"，" r"）即使* some_system_command *没有，也不会引发任何异常存在/工作...... 任何帮助？非常感谢 max max（01） *写道： hi。（剪辑）它不起作用，因为* do_something * ;和* do_something_more *总是被执行（看起来好像是MYPIPE = os.popen（" * some_system_command *"，" r"） >即使* some_system_command *不存在/工作也不会引发任何异常...... 任何帮助？ http://www.python.org/ doc / 2.4.1 / lib /...# os-newstreams &q uot;"" 命令的退出状态（以 wait（）指定的格式编码）可用作close（）的返回值文件对象的方法，除了当退出状态为零（终止没有错误）时，返回None。 " " - bruno desthuilliers python -c" print''@''。join（[''。 ''.join（[w [:: - 1] for p in p.split（''。''）]）for p in''o****@xiludom.gro' '.split（''@''）]）" hi. in perl i can do this: ....if (open (MYPIPE, "*some_system_command* |")){...*do_something*...while ($answer = <MYPIPE>){print $answer;}...*do_something_more*...}else{...*do_something_else*...}.... but i do not know how to do it in python, because "if *command*:" givessyntax error. moreover, if i use ....import os....try:MYPIPE = os.popen("*some_system_command*, "r")...*do_something*...for answer in MYPIPE:print answer,MYPIPE.close()...*do_something_more*...except:...*do_something_else*....... it doesn''t work, since "*do_something*" and *do_something_more* arealways executed (it seems like MYPIPE = os.popen("*some_system_command*", "r") does not raise any exception even if *some_system_command* does notexist/work... any help? thanks a lot max 解决方案 answer = <MYPIPE>){printanswer;}...*do_something_more*...}else{...*do_something_else*...}.... but i do not know how to do it in python, because "if *command*:" givessyntax error. moreover, if i use ....import os....try:MYPIPE = os.popen("*some_system_command*, "r")...*do_something*...for answer in MYPIPE:print answer,MYPIPE.close()...*do_something_more*...except:...*do_something_else*....... it doesn''t work, since "*do_something*" and *do_something_more* arealways executed (it seems like MYPIPE = os.popen("*some_system_command*", "r") does not raise any exception even if *some_system_command* does notexist/work... any help? thanks a lot maxmax(01)* wrote: hi.(snip) it doesn''t work, since "*do_something*" and *do_something_more* are always executed (it seems like MYPIPE = os.popen("*some_system_command*", "r") does not raise any exception even if *some_system_command* does not exist/work... any help? http://www.python.org/doc/2.4.1/lib/...#os-newstreams"""The exit status of the command (encoded in the format specified forwait()) is available as the return value of the close() method of thefile object, except that when the exit status is zero (terminationwithout errors), None is returned."""--bruno desthuillierspython -c "print ''@''.join([''.''.join([w[::-1] for w in p.split(''.'')]) forp in ''o****@xiludom.gro''.split(''@'')])" 这篇关于管道像perl的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！