diff options
| -rw-r--r-- | HACKING.rst | 13 | ||||
| -rw-r--r-- | openstack/common/scheduler/filters/json_filter.py | 2 |
2 files changed, 11 insertions, 4 deletions
diff --git a/HACKING.rst b/HACKING.rst index 3f6a3ed..3cea316 100644 --- a/HACKING.rst +++ b/HACKING.rst @@ -26,16 +26,23 @@ 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 diff --git a/openstack/common/scheduler/filters/json_filter.py b/openstack/common/scheduler/filters/json_filter.py index 273d55e..9118bc2 100644 --- a/openstack/common/scheduler/filters/json_filter.py +++ b/openstack/common/scheduler/filters/json_filter.py @@ -32,7 +32,7 @@ class JsonFilter(filters.BaseHostFilter): if len(args) < 2: return False if op is operator.contains: - bad = not args[0] in args[1:] + bad = args[0] not in args[1:] else: bad = [arg for arg in args[1:] if not op(args[0], arg)] |