Raymond Hettinger added the comment:
ISTM the result of the expression makes the meaning clear:
>>> a | b
{'r', 'l', 'b', 'c', 'z', 'd', 'a', 'm'}
That said, the text might be a little clearer like this:
# letters in a or b or both
----------
assignee: docs@python -> Mariatta
nosy: +Mariatta, rhettinger
priority: normal -> low
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<http://bugs.python.org/issue30312>
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