[Python-Dev] Optional separatorargument for file.writelines() and StringIO.writelines()

[Raymond Hettinger]

Currently, writelines() does not add trailing line separators..
This is fine when working with readlines() but a PITA in other
situations.
 
If we added an optional separator argument, it would be easier to add
newlines and we would gain some of the flexibility of str.join() at full
C speed.
 
 
Raymond Hettinger
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