[issue13510] Clarify that readlines() is not needed to iterate over a file

[Chris Rebert]

Chris Rebert added the comment:

file.readlines() (and perhaps dare I say even file.readline()) should not even be mentioned in the tutorial, IMO. It is difficult to imagine a use case where just iterating over the file object isn't superior. I cannot remember the last time that I have used either of these methods. They ought to be relegated to the library docs. Presenting `for line in a_file:` as merely "An alternative approach" in the official tutorial is practically archaic.

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nosy: +cvrebert

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