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| author | Zhongyue Luo <zhongyue.nah@intel.com> | 2013-02-04 10:07:08 +0800 |
|---|---|---|
| committer | Zhongyue Luo <zhongyue.nah@intel.com> | 2013-02-04 11:12:25 +0800 |
| commit | 896295844a527327b0cd86b10244f403b31f155f (patch) | |
| tree | ac6c8c32db1115885fe01fa5af775a6d73480a33 /HACKING.rst | |
| parent | ee955d272ab4eef2e8371f2e460454058ce7e46c (diff) | |
| download | nova-896295844a527327b0cd86b10244f403b31f155f.tar.gz nova-896295844a527327b0cd86b10244f403b31f155f.tar.xz nova-896295844a527327b0cd86b10244f403b31f155f.zip | |
Update HACKING.rst per recent changes
Added "is not" usage with examples
* https://review.openstack.org/#/c/20865/
Fixed "not in" usage description
* https://review.openstack.org/#/c/20875/
Fixed some "not X in Y" corner cases.
Change-Id: I7534ef73e6fd525fd8f4bee594a4b37524699c08
Diffstat (limited to 'HACKING.rst')
| -rw-r--r-- | HACKING.rst | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/HACKING.rst b/HACKING.rst index 54e3b3275..213495832 100644 --- a/HACKING.rst +++ b/HACKING.rst @@ -28,16 +28,23 @@ General mylist = Foo().list() # OKAY, does not shadow built-in +- Use the "is not" operator when testing for unequal identities. Example:: -- Use the "not in" operator for collection membership evaluation. Example:: + if not X is Y: # BAD, intended behavior is ambiguous + pass + + if X is not Y: # OKAY, intuitive + pass + +- Use the "not in" operator for evaluating membership in a collection. Example:: - if not X in Y: # BAD, hard to understand + if not X in Y: # BAD, intended behavior is ambiguous pass if X not in Y: # OKAY, intuitive pass - if not (X in Y or X is Z): # OKAY, still better than all those 'not's + if not (X in Y or X in Z): # OKAY, still better than all those 'not's pass |