Reasons for source code line length limits

[Terry Reedy]

On 12/7/2014 11:44 PM, Ben Finney wrote:

> Much more relevant is the ability to have two or even three code windows
> side-by-side, for comparison during a merge operation. For this purpose,
> a 75–80 column limit is a great help.

Or Idle Shell | Idle editor1 | Idle editor2
Editor 1 has file being being tested.
Editor 2 has test file.

Write test_xyy, F5, if pass, repeat, else fail, figure out whether test 
or code is bad.


-- 
Terry Jan Reedy