file.readlines() question

[vch]

Does a call to file.readlines() reads all lines at once in the memory? 
Are the any reasons, from the performance point of view, to prefer 
*while* loop with readline() to *for* loop with readlines()?
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Re: file.readlines() question

[vch]

Erik Max Francis wrote:
> ... modern versions of 
> Python allow iteration over a file, which will read it line by line:
> 
> for line in aFile:
> ...
> 

Thanks! Just what I need.
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How does this code works:

[vch]

Here's an example from some book:

def foo(n):
s = [n]
def bar(i):
s[0] += i
return s[0]
return bar

what I don't understand is how this example works, taking into account 
the LGB rule. I thought that s is not accessible from bar, but it is, 
apparently. Why?
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