Re: Context manager for files vs garbage collection

[Bruno Desthuilliers]

Floris Bruynooghe a écrit :
Hi
I was wondering when it was worthwil to use context managers for
file.  Consider this example:

def foo():
    t = False
    for line in file('/tmp/foo'):
        if line.startswith('bar'):
            t = True
            break
    return t

What would the benefit of using a context manager be here, if any?
E.g.:

def foo():
    t = False
    with file('/tmp/foo') as f:
        for line in f:
            if line.startswith('bar'):
                t = True
                break
    return t

Personally I can't really see why the second case would be much
better, I've got used to just relying on the garbage collector... :-)

IIRC (please someone correct me if I'm wrong), proper release of file 
resources as soon as the file object gets out of scope is not garanteed 
in the language spec and is implementation dependant.

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