About deletion of variables in version 2.1

[Juan Huertas]

Hi all.

I'm working with large list or dict an have problems with the deletion and
time of response, this problems does not exist in version 2.0:

Reading a large file and loading to a list:

f=open('c:/xx','rb')
ls=[]
while not eof:
    ln=f.readline()
    ls.append(ln)

This takes 5 seconds (reasonable)

The new instruction:

ls=[] # or del ls

Takes about 10 seconds and use 100% of Memory!!!!

And a continuation repeating the proccess:

while not eof:
    ln=f.readline()
    ls.append(ln)

This takes about 30 seconds !!!

Why? (please aid)

The comprobation is in Windows 2000 and pythonwin

If i try with a new variable, p.e. lx=[] and not refer to ls, the process
take 5 seconds.