Set x to to None and del x doesn't release memory in python 2.7.1 (HPUX 11.23, ia64)

[Bryan Devaney]

On Wednesday, March 6, 2013 10:11:12 AM UTC, Wong Wah Meng-R32813 wrote:
> Hello there,
> 
> 
> 
> I am using python 2.7.1 built on HP-11.23 a Itanium 64 bit box. 
> 
> 
> 
> I discovered following behavior whereby the python process doesn't seem to release memory utilized even after a variable is set to None, and "deleted". I use glance tool to monitor the memory utilized by this process. Obviously after the for loop is executed, the memory used by this process has hiked to a few MB. However, after "del" is executed to both I and str variables, the memory of that process still stays at where it was. 
> 
> 
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> Any idea why?
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> 
> >>> for i in range(100000L):
> 
> ...     str=str+"%s"%(i,) 
> 
> ... 
> 
> >>> i=None
> 
> >>> str=None
> 
> >>> del i
> 
> >>> del str

Hi, I'm new here so I'm making mistakes too but I know they don't like it when you ask your question in someone else's question. 

that being said, to answer your question:

Python uses a 'garbage collector'. When you delete something, all references are removed from the object in memory, the memory itself will not be freed until the next time the garbage collector runs. When that happens, all objects without references in memory are removed and the memory freed.  If you wait a while you should see that memory free itself.