chen-li cc323ce925 Using 'dt' as alias for datetime imports
Many well-known libraries have a conventions regarding which
alias to use. Choosing a different one will not break the code
but makes it less readable and harder to maintain for other
developers. Unless there is specific reason, it is usually best
to use the recommended alias which most people are already
familiar with. For datetime this convention is dt.

Change-Id: Ifba7b7beafdac8377b98ce952b7d3b9dade01670
Closes-Bug: #1535786
2016-02-22 20:04:34 +08:00

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Rally Style Commandments
========================
- Step 1: Read the OpenStack Style Commandments
http://docs.openstack.org/developer/hacking/
- Step 2: Read on
Rally Specific Commandments
---------------------------
* [N30x] - Reserved for rules related to ``mock`` library
* [N301] - Ensure that ``assert_*`` methods from ``mock`` library is used correctly
* [N302] - Ensure that nonexistent "assert_called" is not used
* [N303] - Ensure that nonexistent "assert_called_once" is not used
* [N310-N314] - Reserved for rules related to logging
* [N310] - Ensure that ``rally.common.log`` is used as logging module
* [N311] - Validate that debug level logs are not translated
* [N312] - Validate correctness of debug on check.
* [N32x] - Reserved for rules related to assert* methods
* [N320] - Ensure that ``assertTrue(isinstance(A, B))`` is not used
* [N321] - Ensure that ``assertEqual(type(A), B)`` is not used
* [N322] - Ensure that ``assertEqual(A, None)`` and ``assertEqual(None, A)`` are not used
* [N323] - Ensure that ``assertTrue/assertFalse(A in/not in B)`` are not used with collection contents
* [N324] - Ensure that ``assertEqual(A in/not in B, True/False)`` and ``assertEqual(True/False, A in/not in B)`` are not used with collection contents
* [N340] - Ensure that we are importing always ``from rally import objects``
* [N341] - Ensure that we are importing oslo_xyz packages instead of deprecated oslo.xyz ones
* [N350] - Ensure that single quotes are not used
* [N351] - Ensure that data structs (i.e Lists and Dicts) are declared literally rather than using constructors
* [N352] - Ensure that string formatting only uses a mapping if multiple mapping keys are used.
* [N353] - Ensure that unicode() function is not uset because of absence in py3
* [N354] - Ensure that ``:raises: Exception`` is not used
* [N355] - Ensure that we use only "new-style" Python classes
* [N356] - Ensure using ``dt`` as alias for ``datetime``
* [N360-N370] - Reserved for rules related to CLI
* [N360] - Ensure that CLI modules do not use ``rally.common.db``
* [N361] - Ensure that CLI modules do not use ``rally.common.objects``