diff mercurial/pure/parsers.py @ 34331:531332502568

style: always use `x is not None` instead of `not x is None`

Differential Revision: https://phab.mercurial-scm.org/D842

--- a/mercurial/pure/parsers.py	Sun Apr 24 18:41:23 2016 +0900
+++ b/mercurial/pure/parsers.py	Fri Sep 29 15:49:43 2017 +0000
@@ -80,7 +80,7 @@
         return i * indexsize
 
     def __delitem__(self, i):
-        if not isinstance(i, slice) or not i.stop == -1 or not i.step is None:
+        if not isinstance(i, slice) or not i.stop == -1 or i.step is not None:
             raise ValueError("deleting slices only supports a:-1 with step 1")
         i = self._fix_index(i.start)
         if i < self._lgt:
@@ -114,7 +114,7 @@
         return count
 
     def __delitem__(self, i):
-        if not isinstance(i, slice) or not i.stop == -1 or not i.step is None:
+        if not isinstance(i, slice) or not i.stop == -1 or i.step is not None:
             raise ValueError("deleting slices only supports a:-1 with step 1")
         i = self._fix_index(i.start)
         if i < self._lgt: