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

[Karl Richter]

New submission from Karl Richter:

It would be useful to have a short statement in the docs (https://docs.python.org/2/tutorial/datastructures.html#list-comprehensions) that the expression in a list comprehension isn't put into a block, but evaluated against the same block where it is located because intuitively one might think that variables can be overridden in the statement.
This applies to both 2.7 and 3.4.1.

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assignee: docs at python
components: Documentation
messages: 220374
nosy: docs at python, krichter
priority: normal
severity: normal
status: open
title: Add hint about expression in list comprehensions (https://docs.python.org/2/tutorial/datastructures.html#list-comprehensions)
type: enhancement
versions: Python 2.7

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