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question about file handling with "with"

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  question about file handling with "with" Jabba Laci <jabba.laci@gmail.com> - 2012-03-28 11:31 +0200
    Re: question about file handling with "with" Nobody <nobody@nowhere.com> - 2012-03-29 17:25 +0100

#22269 — question about file handling with "with"

Hi,

Is the following function correct? Is the input file closed in order?

def read_data_file(self):
    with open(self.data_file) as f:
        return json.loads(f.read())

Thanks,

Laszlo

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#22347

On Wed, 28 Mar 2012 11:31:21 +0200, Jabba Laci wrote:

> Is the following function correct? Is the input file closed in order?
> 
> def read_data_file(self):
>     with open(self.data_file) as f:
>         return json.loads(f.read())

Yes.

The whole point of being able to use a file as a context manager is so
that the file will be closed immediately upon leaving the with statement,
whether by falling off the end, "return", an exception, or whatever.

IOW, it's like calling .close() immediately after the "with" block, only
more so, i.e. it will also handle cases that an explicit .close() misses.

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