[Tutor] A Multiple Concatenation Problem

[Cameron Simpson]

On 18Sep2020 09:34, Stephen P. Molnar <s.molnar at sbcglobal.net> wrote:
>I read the data in with:
>
>filename = 'Ligand.list'
>file = open(filename,mode='r')
>text = file.read()
>file.close()

Others are debugging your filename composition, I just wanted to mention 
the above bit of code.

The idiomatic way to write this is:

    with open(filename) as file:
        text = file.read()

Aside from being shorter, there are two things to note here:

1: The default open mode is 'r' (read as text), so you don't need to say 
that.

2: The with... construction closes the file for you, and in fact ensures 
that the close happens even if there is an exception. This ensures 
timely file close and reliable file close.

Cheers,
Cameron Simpson <cs at cskk.id.au>