[docs] [issue21739] Add hint about expression in list comprehensions (https://docs.python.org/2/tutorial/datastructures.html#list-comprehensions)

[Roundup Robot]

Roundup Robot added the comment:

New changeset 84895d037258 by R David Murray in branch '3.4':
#21739: mention subtle difference between loops and listcomps in tutorial.
https://hg.python.org/cpython/rev/84895d037258

New changeset 8279017436a2 by R David Murray in branch 'default':
Merge #21739: mention subtle difference between loops and listcomps in tutorial.
https://hg.python.org/cpython/rev/8279017436a2

----------
nosy: +python-dev

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21739>
_______________________________________