Re: define loop statement?
David Isaac wrote: PS Here's the motivation. Python closely resembles pseudocode. With a very little LaTeX hacking, it is often possible to write algorithms is Python that typeset as reasonable pseudocode. A simple repetitive loop is a bit of a sticking point. With slightly more LaTeX hacking or possibly Python hacking on your script before passing it to LaTeX, you might just be able to change occurences of for x in range(a, b): to for x in [a, b): or whatever, and get away with plain vanilla Python in your code... -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
Benji York [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Here's a flagrant hack: Admiration wins out over revulsion. ;-) Thanks, Alan Isaac PS Here's the motivation. Python closely resembles pseudocode. With a very little LaTeX hacking, it is often possible to write algorithms is Python that typeset as reasonable pseudocode. A simple repetitive loop is a bit of a sticking point. -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
In article [EMAIL PROTECTED], David Isaac [EMAIL PROTECTED] wrote: . . . Admiration wins out over revulsion. ;-) Thanks, Alan Isaac PS Here's the motivation. Python closely resembles pseudocode. With a very little LaTeX hacking, it is often possible to write algorithms is Python that typeset as reasonable pseudocode. A simple repetitive loop is a bit of a sticking point. Wow. Innovative. -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
David Isaac wrote: I would like to be able to define a loop statement (nevermind why) so that I can write something like loop 10: do_something instead of for i in range(10): do_something Possible? If so, how? Ruby and Smalltalk are both good at this kind of thing, since they have syntactic support for associating a block with each method call. In Python, I think you just have to do a little more setup. How about something like this? class Loop: def __init__(self, n): self.n = n def __call__(self): self.n = self.n - 1 return self.n != 0 if __name__ == '__main__': loop = Loop(10) while loop: print OK -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
Jeffrey Schwab wrote: class Loop: def __init__(self, n): self.n = n def __call__(self): self.n = self.n - 1 return self.n != 0 if __name__ == '__main__': loop = Loop(10) while loop: print OK Seems you forgot () after while loop above. Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
Jeffrey Schwab wrote: class Loop: def __init__(self, n): self.n = n def __call__(self): self.n = self.n - 1 return self.n != 0 if __name__ == '__main__': loop = Loop(10) while loop: Whoops. Should be while loop(). print OK -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
Alan Isaac wrote: I would like to be able to define a loop statement (nevermind why) so that I can write something like loop 10: do_something instead of for i in range(10): do_something Possible? If so, how? Jeffrey Schwab [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] class Loop: def __init__(self, n): self.n = n def __call__(self): self.n = self.n - 1 return self.n != 0 if __name__ == '__main__': loop = Loop(10) while loop(): print OK OK, that's pretty good. Thanks! Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
Em Sáb, 2006-02-18 às 20:04 +, Jeffrey Schwab escreveu: if __name__ == '__main__': loop = Loop(10) while loop: print OK Maybe: while Loop(10)(): print OK Looks rather ugly but requires one less line ;-). -- Quem excele em empregar a força militar subjulga os exércitos dos outros povos sem travar batalha, toma cidades fortificadas dos outros povos sem as atacar e destrói os estados dos outros povos sem lutas prolongadas. Deve lutar sob o Céu com o propósito primordial da 'preservação'. Desse modo suas armas não se embotarão, e os ganhos poderão ser preservados. Essa é a estratégia para planejar ofensivas. -- Sun Tzu, em A arte da guerra -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
Felipe Almeida Lessa wrote: Em Sáb, 2006-02-18 às 20:04 +, Jeffrey Schwab escreveu: if __name__ == '__main__': loop = Loop(10) while loop: print OK Maybe: while Loop(10)(): print OK Looks rather ugly but requires one less line ;-). Doesn't work. You get a NEW Loop(10) instance on each pass through the 'while'. This is just an expensive way to make an endless loop. -- Nigel Rowe A pox upon the spammers that make me write my address like.. rho (snail) swiftdsl (stop) com (stop) au -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
Em Dom, 2006-02-19 às 11:08 +1100, Nigel Rowe escreveu: Felipe Almeida Lessa wrote: Em Sáb, 2006-02-18 às 20:04 +, Jeffrey Schwab escreveu: if __name__ == '__main__': loop = Loop(10) while loop: print OK Maybe: while Loop(10)(): print OK Looks rather ugly but requires one less line ;-). Doesn't work. You get a NEW Loop(10) instance on each pass through the 'while'. This is just an expensive way to make an endless loop. Oh, sorry, ignore me on that one. Now I think I should sleep =S... -- Quem excele em empregar a força militar subjulga os exércitos dos outros povos sem travar batalha, toma cidades fortificadas dos outros povos sem as atacar e destrói os estados dos outros povos sem lutas prolongadas. Deve lutar sob o Céu com o propósito primordial da 'preservação'. Desse modo suas armas não se embotarão, e os ganhos poderão ser preservados. Essa é a estratégia para planejar ofensivas. -- Sun Tzu, em A arte da guerra -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
David Isaac wrote: I would like to be able to define a loop statement (nevermind why) so that I can write something like loop 10: do_something Here's a flagrant hack: import sys VAR_NAME = '__repeat_counter' def set_repeat_counter(value): frame = sys._getframe(2) frame.f_locals[VAR_NAME] = value def get_repeat_counter(value): frame = sys._getframe(2) if VAR_NAME not in frame.f_locals: frame.f_locals[VAR_NAME] = value return frame.f_locals[VAR_NAME] def repeat(limit): set_repeat_counter(get_repeat_counter(limit)-1) return get_repeat_counter(limit) while repeat(10): print 'OK' Without more work it doesn't allow nested loops though. And for the record, if you're worrying about Python's counted loop construct you need better things to worry about. insert-smilies-as-appropriate -- Benji York -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
Rene Pijlman wrote: David Isaac: I would like to be able to define a loop statement (nevermind why) so that I can write something like loop 10: do_something instead of for i in range(10): do_something Possible? If so, how? Yes. By implementing a compiler or an interpreter for your programming language. Or a preprocessor that converts your language to Python, or some other suitable intermediate language. Or a programmer, that converts your pseudocode and some coffee to the desired algorithm :-) Or by hacking through the Python source and creating his own somehow pythonish but absolutely not python language -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
David Isaac wrote: I would like to be able to define a loop statement (nevermind why) so that I can write something like loop 10: do_something instead of for i in range(10): do_something Possible? If so, how? It's not possible to create a new statement, with suite and indentation rules without hacking the interpreter or resorting to alternative bytecode compilers such as pyc. Creating a _function_ named loop is easy as Jonathan's answer shows. Georg -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
David Isaac: I would like to be able to define a loop statement (nevermind why) so that I can write something like loop 10: do_something instead of for i in range(10): do_something Possible? If so, how? Yes. By implementing a compiler or an interpreter for your programming language. Or a preprocessor that converts your language to Python, or some other suitable intermediate language. Or a programmer, that converts your pseudocode and some coffee to the desired algorithm :-) -- René Pijlman -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
David Isaac: I would like to be able to define a loop statement (nevermind why) so that I can write something like loop 10: do_something instead of for i in range(10): do_something Possible? If so, how? It seems that you are looking for macros; maybe Logix language (www.livelogix.net/logix) or Boo (boo.codehaus.org) can solve your problem. Otherwise you can do it with very different languages like Lisp or Scheme (with a different syntax) and maybe Dylan too. If you tell us your purpose, maybe we can suggest you a better/different solution. Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Re: define loop statement?
Rene Pijlman wrote: David Isaac: I would like to be able to define a loop statement (nevermind why) so that I can write something like loop 10: do_something instead of for i in range(10): do_something Possible? If so, how? Yes. By implementing a compiler or an interpreter for your programming language. Or a preprocessor that converts your language to Python, or some other suitable intermediate language. Or a programmer, that converts your pseudocode and some coffee to the desired algorithm :-) Or by hacking through the Python source and creating his own somehow pythonish but absolutely not python language -- http://mail.python.org/mailman/listinfo/python-list
