[docs] [issue29968] Document that no characters are allowed to proceed \ in explicit line joining

[Martin Panter]

Martin Panter added the comment:

I think he means make something like the following legal, where dots (.) indicate space characters:

a.=.\.
....b

At the moment it is a SyntaxError:

>>> a = \ 
  File "<stdin>", line 1
    a = \ 
         ^
SyntaxError: unexpected character after line continuation character

I don’t think it is worthwhile changing that.

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nosy: +martin.panter

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<http://bugs.python.org/issue29968>
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