On Sat, 24 Jul 2010 06:00:21 pm Alan Gauld wrote: > "ANKUR AGGARWAL" <[email protected]> wrote > > > hey this is a crazy question but i want to know it...... > > suppose i have this code > > > > a=raw_input("enter the string :") > > print a > > > > now i want to ask is there's any way that python remembers the > > input i gave > > it to last time and it just give me the output when i again run > > python > > No that is impossible, python is an interpreter and if it remembered > its input you would only ever be able to run one program. What you > want to do is get your program to remember its input, and that is > possible. It is very important you are clear in your mind what is > python and what is your code.
You shouldn't have trimmed the rest of Ankur's post, because he clearly states he's talking about his program, not Python specifically: "now i want to ask is there's any way that python remembers the input i gave it to last time and it just give me the output when i again run python prog.py?????? i mean i dont need to give input again. I just need to give input only first time and when i run the prog again it will pick up the previous one output is it possible???" Well, for some definition of "clearly" :) > You cannot change much in Python(*), you can > change anything in your code. Actually, you can change a lot in Python, but often you shouldn't. Any module you import, including builtins, can be monkey-patched (modified on the fly), although that's rightfully considered to be dangerous and best avoided except under very special circumstances. You can't change syntax, or literals, or a handful of fixed objects like None, but otherwise most things in Python can be modified, if you know what you're doing and/or silly enough to modify them. And of course when you start up Python, it reads a number of environment variables and config files, which give you an opportunity to have Python remember your input from last session. For example, I have a very minimal PYTHONSTARTUP file which automatically imports os and sys. I had also experimented with having it back-port functionality from versions 2.6 to 2.5. Some people use it to customize things like the prompt in the interactive interpreter, or install a tab-completion module, provide history which survives shutting down the interpreter (like most Linux shells already do), or otherwise provide added functionality such as that provided by (e.g.) IPython. http://ipython.scipy.org/moin So there are plenty of reasons to want Python to remember your input, and plenty of ways to do so. -- Steven D'Aprano _______________________________________________ Tutor maillist - [email protected] To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
