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. 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.
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