如何在python中製作命令行解釋器？

我對Python很新。我試圖修改一個腳本，使其在無限循環中運行，將從控制檯獲取命令，並根據我定義的命令行事。如何在python中製作命令行解釋器？

我談論的東西，可以做下面的例子：使用argpars

Shell> myconsole.py 
> h 
Usage: [set_param1 [a1 [a2...]]] [set_param2 [b1 [b2...]]] [send_params] 
> set_param1 4 
> set_param2 5 6 
> send_params 
Parameters sent successfully! 
> quit 
Shell>

我試過，但我有幾個問題吧：
1.如果我不」它不能正常工作至少有一個參數與' - '
2.當我呼叫幫助（'h'/'help'）或提出一個壞的參數時，它會顯示幫助並卡住。我希望它回到無限循環並等待更多命令。

我讀過帖子：how to make a Command Line Interface or Interpreter in python
這不是真的有幫助。

任何人都可以幫忙嗎？

感謝，
古爾

來源

2014-02-12 Gur Arie

寫的[cmd.Cmd]一個子類（ http://docs.python.org/2/library/cmd.html#module-cmd） –

如何讓一個命令行解釋在Python？

不知道如何在Python中做到這一點，但我可以告訴你如何編寫一個從YOURS語言到BATCH的小型解釋器。

首先是如何將它的工作：您在文件中輸入一些東西，像代碼：_display = Hello World! 和解釋器將其轉換爲echo Hello World!

所以它是隻需要更換代碼。所以多數民衆贊成：

type %name%|repl "_display =" "echo" >compiler.log 
move /y compiler.log %name%

和最新行：

type %name%|repl "a code statement" "translation" >compiler.log 
move /y compiler.log %name%.**bat**

的%name%只是一個變量，您可以通過文件名來取代或鍵入

詢問文件名用戶

set/p name="Name Of Project: "

所以那就是它！您可以使用BATCH語言編寫自己的編程語言！ BATCH語言也在記事本中，不需要編譯器。

等等！你需要一個REPL文件！複製此：

@if (@X)==(@Y) @end /* Harmless hybrid line that begins a JScript comment 
@echo off 
if .%2 equ . (
    if "%~1" equ "/?" (
    <"%~f0" cscript //E:JScript //nologo "%~f0" "^:::" "" a 
    exit /b 0 
) else if /i "%~1" equ "/?regex" (
    explorer "http://msdn.microsoft.com/en-us/library/ae5bf541(v=vs.80).aspx" 
    exit /b 0 
) else if /i "%~1" equ "/?replace" (
    explorer "http://msdn.microsoft.com/en-US/library/efy6s3e6(v=vs.80).aspx" 
    exit /b 0 
) else if /i "%~1" equ "/V" (
    <"%~f0" cscript //E:JScript //nologo "%~f0" "^::(REPL\.BAT version)" "$1" a 
    exit /b 0 
) else (
    call :err "Insufficient arguments" 
    exit /b 2 
) 
) 
echo(%~3|findstr /i "[^SMILEBVXAJ]" >nul && (
    call :err "Invalid option(s)" 
    exit /b 2 
) 
echo(%~3|findstr /i "M"|findstr /i "A"|findstr /vi "S" >nul && (
    call :err "Incompatible options" 
    exit /b 2 
) 
cscript //E:JScript //nologo "%~f0" %* 
exit /b %errorlevel% 

:err 
>&2 echo ERROR: %~1. Use REPL /? to get help. 
exit /b 

************* JScript portion **********/ 
var rtn=1; 
try { 
    var env=WScript.CreateObject("WScript.Shell").Environment("Process"); 
    var args=WScript.Arguments; 
    var search=args.Item(0); 
    var replace=args.Item(1); 
    var options="g"; 
    if (args.length>2) options+=args.Item(2).toLowerCase(); 
    var multi=(options.indexOf("m")>=0); 
    var alterations=(options.indexOf("a")>=0); 
    if (alterations) options=options.replace(/a/g,""); 
    var srcVar=(options.indexOf("s")>=0); 
    if (srcVar) options=options.replace(/s/g,""); 
    var jexpr=(options.indexOf("j")>=0); 
    if (jexpr) options=options.replace(/j/g,""); 
    if (options.indexOf("v")>=0) { 
    options=options.replace(/v/g,""); 
    search=env(search); 
    replace=env(replace); 
    } 
    if (options.indexOf("x")>=0) { 
    options=options.replace(/x/g,""); 
    if (!jexpr) { 
     replace=replace.replace(/\\\\/g,"\\B"); 
     replace=replace.replace(/\\q/g,"\""); 
     replace=replace.replace(/\\x80/g,"\\u20AC"); 
     replace=replace.replace(/\\x82/g,"\\u201A"); 
     replace=replace.replace(/\\x83/g,"\\u0192"); 
     replace=replace.replace(/\\x84/g,"\\u201E"); 
     replace=replace.replace(/\\x85/g,"\\u2026"); 
     replace=replace.replace(/\\x86/g,"\\u2020"); 
     replace=replace.replace(/\\x87/g,"\\u2021"); 
     replace=replace.replace(/\\x88/g,"\\u02C6"); 
     replace=replace.replace(/\\x89/g,"\\u2030"); 
     replace=replace.replace(/\\x8[aA]/g,"\\u0160"); 
     replace=replace.replace(/\\x8[bB]/g,"\\u2039"); 
     replace=replace.replace(/\\x8[cC]/g,"\\u0152"); 
     replace=replace.replace(/\\x8[eE]/g,"\\u017D"); 
     replace=replace.replace(/\\x91/g,"\\u2018"); 
     replace=replace.replace(/\\x92/g,"\\u2019"); 
     replace=replace.replace(/\\x93/g,"\\u201C"); 
     replace=replace.replace(/\\x94/g,"\\u201D"); 
     replace=replace.replace(/\\x95/g,"\\u2022"); 
     replace=replace.replace(/\\x96/g,"\\u2013"); 
     replace=replace.replace(/\\x97/g,"\\u2014"); 
     replace=replace.replace(/\\x98/g,"\\u02DC"); 
     replace=replace.replace(/\\x99/g,"\\u2122"); 
     replace=replace.replace(/\\x9[aA]/g,"\\u0161"); 
     replace=replace.replace(/\\x9[bB]/g,"\\u203A"); 
     replace=replace.replace(/\\x9[cC]/g,"\\u0153"); 
     replace=replace.replace(/\\x9[dD]/g,"\\u009D"); 
     replace=replace.replace(/\\x9[eE]/g,"\\u017E"); 
     replace=replace.replace(/\\x9[fF]/g,"\\u0178"); 
     replace=replace.replace(/\\b/g,"\b"); 
     replace=replace.replace(/\\f/g,"\f"); 
     replace=replace.replace(/\\n/g,"\n"); 
     replace=replace.replace(/\\r/g,"\r"); 
     replace=replace.replace(/\\t/g,"\t"); 
     replace=replace.replace(/\\v/g,"\v"); 
     replace=replace.replace(/\\x[0-9a-fA-F]{2}|\\u[0-9a-fA-F]{4}/g, 
     function($0,$1,$2){ 
      return String.fromCharCode(parseInt("0x"+$0.substring(2))); 
     } 
    ); 
     replace=replace.replace(/\\B/g,"\\"); 
    } 
    search=search.replace(/\\\\/g,"\\B"); 
    search=search.replace(/\\q/g,"\""); 
    search=search.replace(/\\x80/g,"\\u20AC"); 
    search=search.replace(/\\x82/g,"\\u201A"); 
    search=search.replace(/\\x83/g,"\\u0192"); 
    search=search.replace(/\\x84/g,"\\u201E"); 
    search=search.replace(/\\x85/g,"\\u2026"); 
    search=search.replace(/\\x86/g,"\\u2020"); 
    search=search.replace(/\\x87/g,"\\u2021"); 
    search=search.replace(/\\x88/g,"\\u02C6"); 
    search=search.replace(/\\x89/g,"\\u2030"); 
    search=search.replace(/\\x8[aA]/g,"\\u0160"); 
    search=search.replace(/\\x8[bB]/g,"\\u2039"); 
    search=search.replace(/\\x8[cC]/g,"\\u0152"); 
    search=search.replace(/\\x8[eE]/g,"\\u017D"); 
    search=search.replace(/\\x91/g,"\\u2018"); 
    search=search.replace(/\\x92/g,"\\u2019"); 
    search=search.replace(/\\x93/g,"\\u201C"); 
    search=search.replace(/\\x94/g,"\\u201D"); 
    search=search.replace(/\\x95/g,"\\u2022"); 
    search=search.replace(/\\x96/g,"\\u2013"); 
    search=search.replace(/\\x97/g,"\\u2014"); 
    search=search.replace(/\\x98/g,"\\u02DC"); 
    search=search.replace(/\\x99/g,"\\u2122"); 
    search=search.replace(/\\x9[aA]/g,"\\u0161"); 
    search=search.replace(/\\x9[bB]/g,"\\u203A"); 
    search=search.replace(/\\x9[cC]/g,"\\u0153"); 
    search=search.replace(/\\x9[dD]/g,"\\u009D"); 
    search=search.replace(/\\x9[eE]/g,"\\u017E"); 
    search=search.replace(/\\x9[fF]/g,"\\u0178"); 
    if (options.indexOf("l")>=0) { 
     search=search.replace(/\\b/g,"\b"); 
     search=search.replace(/\\f/g,"\f"); 
     search=search.replace(/\\n/g,"\n"); 
     search=search.replace(/\\r/g,"\r"); 
     search=search.replace(/\\t/g,"\t"); 
     search=search.replace(/\\v/g,"\v"); 
     search=search.replace(/\\x[0-9a-fA-F]{2}|\\u[0-9a-fA-F]{4}/g, 
     function($0,$1,$2){ 
      return String.fromCharCode(parseInt("0x"+$0.substring(2))); 
     } 
    ); 
     search=search.replace(/\\B/g,"\\"); 
    } else search=search.replace(/\\B/g,"\\\\"); 
    } 
    if (options.indexOf("l")>=0) { 
    options=options.replace(/l/g,""); 
    search=search.replace(/([.^$*+?()[{\\|])/g,"\\$1"); 
    if (!jexpr) replace=replace.replace(/\$/g,"$$$$"); 
    } 
    if (options.indexOf("b")>=0) { 
    options=options.replace(/b/g,""); 
    search="^"+search 
    } 
    if (options.indexOf("e")>=0) { 
    options=options.replace(/e/g,""); 
    search=search+"$" 
    } 
    var search=new RegExp(search,options); 
    var str1, str2; 

    if (srcVar) { 
    str1=env(args.Item(3)); 
    str2=str1.replace(search,jexpr?replFunc:replace); 
    if (!alterations || str1!=str2) if (multi) { 
     WScript.Stdout.Write(str2); 
    } else { 
     WScript.Stdout.WriteLine(str2); 
    } 
    if (str1!=str2) rtn=0; 
    } else if (multi){ 
    var buf=1024; 
    str1=""; 
    while (!WScript.StdIn.AtEndOfStream) { 
     str1+=WScript.StdIn.Read(buf); 
     buf*=2 
    } 
    str2=str1.replace(search,jexpr?replFunc:replace); 
    WScript.Stdout.Write(str2); 
    if (str1!=str2) rtn=0; 
    } else { 
    while (!WScript.StdIn.AtEndOfStream) { 
     str1=WScript.StdIn.ReadLine(); 
     str2=str1.replace(search,jexpr?replFunc:replace); 
     if (!alterations || str1!=str2) WScript.Stdout.WriteLine(str2); 
     if (str1!=str2) rtn=0; 
    } 
    } 
} catch(e) { 
    WScript.Stderr.WriteLine("JScript runtime error: "+e.message); 
    rtn=3; 
} 
WScript.Quit(rtn); 

function replFunc($0, $1, $2, $3, $4, $5, $6, $7, $8, $9, $10) { 
    var $=arguments; 
    return(eval(replace)); 
}

..並保存到一個名爲批處理文件（.bat）「repl.bat」

〜whispereq 2017年

來源

2017-06-02 16:32:37 whispereq

如何在python中製作命令行解釋器？

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