interpreter

i am creating ( researching possibility of ) a highly customizable python client and would like to allow users to actually edit the code in another language to customize the running of program. ( analogous to browser which itself coded in c/c++ and run another language html/js ). so my question is , is there any programming language implemented in pure python which i can see as a reference ( or use directly ? ) -- i need simple language ( simple statements and ifs can do ) edit: sorry if i did not make myself clear but what i want is "a language to customize the running of program" , even

I need to develop an application that will read and understand text file in which I'll find a custom language that describe a list of operations (ie cooking recipe). This language has not been defined yet, but it will probably take one of the following shape : C++ like code (This code is randomly generated, just for example purpose) : begin repeat(10) { bar(toto, 10, 1999, xxx); } result = foo(xxxx, 10); if(foo == ok) { ... } else { ... } end XML code (This code is randomly generated, just for example purpose) : <recipe> <action name="foo" argument"bar, toto, xxx" repeat=10/> <action name="bar

I am looking in to the performance issues of the loop like structures in Python and found the following statements: Besides the syntactic benefit of list comprehensions, they are often as fast or faster than equivalent use of map. ( Performance Tips ) List comprehensions run a bit faster than equivalent for-loops (unless you're just going to throw away the result). ( Python Speed ) I am wondering what difference under the hood gives list comprehension this advantage. Thanks. Test one : throwing away the result. Here's our dummy function: def examplefunc(x): pass And here are our challengers:

Very similar to this question: How can I start an interactive console for Perl? I just want to be able to start entering VBS statements, one at a time, and have them evaluated straight away, like Python's IDLE. Ansgar Wiechers I wrote this a couple years ago. It's based on this blog post (archived here ), but with a couple enhancements. Essentially it's a REPL (Read, Execute, Print, Loop) using the Execute statement: Do While True WScript.StdOut.Write(">>> ") line = Trim(WScript.StdIn.ReadLine) If LCase(line) = "exit" Then Exit Do On Error Resume Next Execute line If Err.Number <> 0 Then

I've a DSL written using Xtext. What I want is to execute that DSL to perform something good out of it. I wrote myDslGenerator class implementing the interface IGenerator in xtend to generate java code and it's working fine. I've two questions; What is the difference between Interpreter and Code Generator? Aren't both for executing DSL? How to write an interpreter? Any step by step tutorial link? I found many tutorial to generate code using xtend but couldn't find any for writing an interpreter. Thank you, Salman Basically, interpreters and code generators work really differently. Code