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close() the file when opening "with"?

On 2020-06-14, Chris Angelico <rosuav at> wrote:
> On Sun, Jun 14, 2020 at 8:16 PM Bischoop <Bischoop at> wrote:
>> So far I learnt "with" closes the file opened therefore "Generally" no
>> need to close() file. I'm worry about this "Generally", then close() or
>> not?
> Where did you learn that? Can you cite a reference?
> If you use a with block, the file is guaranteed to be closed as you
> exit that block. It's that simple.
> ChrisA

Where I learnt what that "with" closes the file or that "Generally" no
need to close() file when using "with"?