Re: ???Python Memory Management S***s???
On 4/20/08, Hank @ITGroup [EMAIL PROTECTED] wrote: Hi, people! Greetings~ These days I have been running a text processing program, written by python, of cause. In order to evaluate the memory operation, I used the codes below: string1 = ['abcde']*99# this took up an obvious memory space... del string1 # this freed the memory successfully !! For primary variants, the *del* thing works well. However, challenge the following codes, using class-instances... from nltk import FreqDist # nltk stands for Natural Language Tool Kit (this is not an advertisement ~_~) instance = FreqDist() instanceList = [instance]*9 del instanceList # You can try: nothing is freed by this ??? How do you people control python to free the memory in python 2.5 or python 2.4 ??? Cheers!!! I don't know about the others, I personally let the garbage collector take care of it. HTH, Daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: ???Python Memory Management S***s???
On Sun, 20 Apr 2008 18:40:26 +1000, Hank @ITGroup wrote: In order to evaluate the memory operation, I used the codes below: string1 = ['abcde']*99# this took up an obvious memory space... del string1 # this freed the memory successfully !! Indirectly. ``del`` does not delete objects but just names, so you deleted the name `string1` and then the garbage collector kicked in and freed the list object as it was not reachable by other references anymore. For primary variants, the *del* thing works well. However, challenge the following codes, using class-instances... from nltk import FreqDist # nltk stands for Natural Language Tool Kit (this is not an advertisement ~_~) instance = FreqDist() instanceList = [instance]*9 del instanceList # You can try: nothing is freed by this How do you know this? And did you spot the difference between 99 and 9!? Are you aware that both lists contain many references to a *single* object, so the memory consumption has very little to do with the type of object you put into the list? In the second case you still hold a reference to that single instance though. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: ???Python Memory Management S***s???
On Apr 20, 9:40 am, Hank @ITGroup [EMAIL PROTECTED] wrote: Hi, people! Greetings~ These days I have been running a text processing program, written by python, of cause. In order to evaluate the memory operation, I used the codes below: string1 = ['abcde']*99 # this took up an obvious memory space... del string1 # this freed the memory successfully !! For primary variants, the *del* thing works well. However, challenge the following codes, using class-instances... from nltk import FreqDist # nltk stands for Natural Language Tool Kit (this is not an advertisement ~_~) instance = FreqDist() instanceList = [instance]*9 del instanceList # You can try: nothing is freed by this ??? How do you people control python to free the memory in python 2.5 or python 2.4 ??? Cheers!!! You mistyped your subject line; it should have read: Help needed - I don't understand how Python manages memory -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
