我如何在Google App Engine上设置PyParsing？ [英] How do I get PyParsing set up on the Google App Engine?

问题描述

我在Google App Engine文档中看到 http://www.antlr.org/ Antlr3被用作解析第三方库。

但是从我所知道的Pyparsing看起来更容易使用，我只是旨在解析一些简单的语法。

是否有替代方案？我可以在App Engine上使用pyparsing工作吗？

解决方案

Just do it！ - ）获取pyparsing.py，例如从此处，并将其放入您的应用引擎应用的目录;现在你可以在你的应用程序代码中使用 import pyparsing 并使用它。 例如，调整greeting.py从此处：

  from pyparsing import Word，alphas 
 greet = Word（alphas）+，+ Word（alphas）+！ ＃<  - 此处定义的语法
 hello =Hello，World！ 
 printContent-type：text / plain \\\

 print hello， - >，greet.parseString（hello）
  

在处理程序中添加到您的app.yaml：两行：

   -  url：/ parshello 
 script：greeting.py 
  

启动您的应用程序，访问 http：// localhost：8083 / parshello （或您在其上运行的任何端口;-)，以及你会在浏览器中看到纯文本输出：

  Hello，World！ - > ['Hello'，'，'，'World'，'！'] 
  

I saw on the Google App Engine documentation that http://www.antlr.org/ Antlr3 is used as the parsing third party library.

But from what I know Pyparsing seems to be the easier to use and I am only aiming to parse some simple syntax.

Is there an alternative? Can I get pyparsing working on the App Engine?

解决方案

"Just do it"!-) Get pyparsing.py, e.g. from here, and put it in your app engine app's directory; now you can just import pyparsing in your app code and use it.

For example, tweak the greeting.py from here to be:

from pyparsing import Word, alphas
greet = Word( alphas ) + "," + Word( alphas ) + "!" # <-- grammar defined here
hello = "Hello, World!"
print "Content-type: text/plain\n"
print hello, "->", greet.parseString( hello )

add to your app.yaml right under handlers: the two lines:

- url: /parshello
  script: greeting.py

start your app, visit http://localhost:8083/parshello (or whatever port you're running on;-), and you'll see in your browser the plain text output:

Hello, World! -> ['Hello', ',', 'World', '!']

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