Quick question about threads and interpreters.
Lets say I have a program that is running a python interpreter in the main thread. I come along, write a .DLL and throw it into the program. My .dll has its own thread (right?), separate from the main thread, and then makes a pyrun_simplestring call to the pythonxx.dll. The pyrun_simplestring call attempts to make contact with a function in the original python program. In short, I'm attempting to leverage existing functionality in the original python program from my .DLL. I'm sure that sounds confusing, so maybe: PythonInterpreter_MainThread is running some SourceCode, MyDLL_PyRun_SimpleString_OtherThread makes call(?) to the same SourceCode. Now, my question is: What happens? Is another python interpreter instance created in my .dll thread to handle that call? is my call 'separate' from the main thread interpreter? I'm hoping someone can point me towards some material to better understand what might happen if I did what I outlined above. It's a small school project (not homework, just a hey, remember when I asked you about blahblah, well I got it working!) and I'd appreciate any guidance I could get into the dark arts of multiple threads and how they relate to python interpreters, and if multiple python interpreters are created (one for each thread) how making calls to the same code works. Thank you for your time. -- http://mail.python.org/mailman/listinfo/python-list
Book Recomendations
I am an experienced programmer (40 years). I've done Algol (if you've heard of that you must be old too), PL/1, VB,VBA, a little C, and a few other odd languages (e.g. Taskmate). I'm interested in learning Python and have downloaded a slew of books. Too many. I'd like a recommendation as to which books are considered to be the cream of the crop. I know there are tutorials on the web, but, again, I don't know the quality. I would appreciate recommendations on those as well. Thanks Ira -- http://mail.python.org/mailman/listinfo/python-list
Sorting Large File (Code/Performance)
Hello all, I have an Unicode text file with 1.6 billon lines (~2GB) that I'd like to sort based on first two characters. I'd greatly appreciate if someone can post sample code that can help me do this. Also, any ideas on approximately how long is the sort process going to take (XP, Dual Core 2.0GHz w/2GB RAM). Cheers, Ira -- http://mail.python.org/mailman/listinfo/python-list
Re: Sorting Large File (Code/Performance)
Thanks to all who replied. It's very appreciated. Yes, I had to doublecheck line counts and the number of lines is ~16 million (insetead of stated 1.6B). Also: What is a Unicode text file? How is it encoded: utf8, utf16, utf16le, utf16be, ??? If you don't know, do this: The file is UTF-8 Do the first two characters always belong to the ASCII subset? Yes, first two always belong to ASCII subset What are you going to do with it after it's sorted? I need to isolate all lines that start with two characters (zz to be particular) Here's a start: http://docs.python.org/lib/typesseq-mutable.html Google GnuWin32 and see if their sort does what you want. Will do, thanks for the tip. If you really have a 2GB file and only 2GB of RAM, I suggest that you don't hold your breath. I am limited with resources. Unfortunately. Cheers, Ira -- http://mail.python.org/mailman/listinfo/python-list
Filtering content of a text file
Hello All, I'd greatly appreciate if you can take a look at the task I need help with. It'd be outstanding if someone can provide some sample Python code. Thanks a lot, Ira --- Problem --- I am working with 30K+ record datasets in flat file format (.txt) that look like this: //-+alibaba sinage //-+amra damian//_9 //-+anix anire//_ //-+borom //-+bokima sun drane //-+ciren //-+cop calestieon eded //-+ciciban //-+drago kimano sole The records start with the same string (in the example //-+) wich is followed by another string of characters taht's changing from record to record. I am working on one file at the time and for each file I need to be able to do the following: a) By looping thru the file the program should isolate all records that have letter a following the //-+ b) The isolated dataset will contain only records that start with //- +a c) Save the isolated dataset as flat flat text file named a.txt d) Repeat a), b) and c) for all letters of english alphabet (a thru z) and numerical values (0 thru 9) CP: An inch of time is an inch of gold but you can't buy that inch of time with an inch of gold. Random Link Generator -- http://www.transactioncodes.com -- -- http://mail.python.org/mailman/listinfo/python-list
Re: Filtering content of a text file
Thanks all for the input. This is going to be a great basis for starting. And, yeah - I wish it was a homework. Best, Ira -- http://mail.python.org/mailman/listinfo/python-list
Re: Changing interpreter's deafult output/error streams
OK let me rephrase, the standard error stream (and if I'm not mistaken also the one that PyErr_Print() writes to) is the python object sys.stderr. Now say I'd go ahead and write the following in python... SomeNewStreamOrFileOrWhateverItIs = new stream sys.stderr = SomeNewStreamOrFileOrWhateverItIs I can go ahead and do the exact same thing from the C source code. All I need to do is to figure out how to wrap a c-style FILE* with a PyObject, And PySys_SetObjet(stderr, newstream); I'm very new to python so that might be nonsense but it appeals to my programmer's common sense. Can anyone tell me how to do this? Michael Hudson [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Ira [EMAIL PROTECTED] writes: Using an embedded interpreter, how do I change it's default output streams (specifically the one used by PyErr_Print() which I'm guessing is the default error stream)? It looks as though it writes to stderr unconditionally. But most of the reasons for ended up in PyErr_Print can be intercepted at a higher level (I think -- I mean sys.excepthook co here). Cheers, mwh -- ARTHUR: Yes. It was on display in the bottom of a locked filing cabinet stuck in a disused lavatory with a sign on the door saying Beware of the Leopard. -- The Hitch-Hikers Guide to the Galaxy, Episode 1 -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Changing interpreter's deafult output/error streams
OK let me rephrase, the standard error stream (and if I'm not mistaken also the one that PyErr_Print() writes to) is the python object sys.stderr. Now say I'd go ahead and write the following in python... SomeNewStreamOrFileOrWhateverItIs = new stream sys.stderr = SomeNewStreamOrFileOrWhateverItIs I can go ahead and do the exact same thing from the C source code. All I need to do is to figure out how to wrap a c-style FILE* with a PyObject, And PySys_SetObjet(stderr, newstream); I'm very new to python so that might be nonsense but it appeals to my programmer's common sense. Can anyone tell me how to do this? Michael Hudson [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Ira [EMAIL PROTECTED] writes: Using an embedded interpreter, how do I change it's default output streams (specifically the one used by PyErr_Print() which I'm guessing is the default error stream)? It looks as though it writes to stderr unconditionally. But most of the reasons for ended up in PyErr_Print can be intercepted at a higher level (I think -- I mean sys.excepthook co here). Cheers, mwh -- ARTHUR: Yes. It was on display in the bottom of a locked filing cabinet stuck in a disused lavatory with a sign on the door saying Beware of the Leopard. -- The Hitch-Hikers Guide to the Galaxy, Episode 1 -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Changing interpreter's deafult output/error streams
Hi, Using an embedded interpreter, how do I change it's default output streams (specifically the one used by PyErr_Print() which I'm guessing is the default error stream)? Cheers, Ira -- http://mail.python.org/mailman/listinfo/python-list
