On Sat, 31 Aug 2019 16:37:23 +0200
Peter Otten <__pete...@web.de> wrote:
> Manfred Lotz wrote:
>
> > Hi there,
> > This is a beginner question.
> >
> > I learned that
> >
> > with open("foo.txt") as f:
> > lines = f.readlines()
> >
> > using the with-construct is the recommended way to deal with files
> > making sure that close() always happens.
> >
> > However, I also could do:
> >
> > lines = open("foo.txt").readlines()
> >
> > I have to admit that I'm not sure if in case something bad happens a
> > close() is done implicitly as in the first example.
> >
> >
> > Could I use the latter as a substitute for the with-construct? What
> > are the recommendations of the experts?
>
> Always using
>
> with open(...) ...
>
> is a good habit to get into.
As a Python beginner I started to use with open.. in all cases but was
tempted to use the even shorter one-line way of reading a file.
So, I will continue to use with open... ALWAYS as good habits are very
helpful in life. :-)
> if you need to read all lines of a file
> very often write a helper function:
>
> def readlines(filename):
> with open(filename) as f:
> return f.readlines()
>
> That way you can write
>
> lines = readlines("foo.txt")
>
> which saves even more typing and still closes the file
> deterministically.
>
Good idea.
Thanks to all for your help.
--
Manfred
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