use 'x is None' instead of 'x == None'
The built-in None object is a singleton and it is therefore safe to
compare memory addresses with is. It is also faster, how much depends
on the object being compared. For a simple type like str I get:
| s = "foo" | s = None
----------+-----------+----------
s == None | 0.25 usec | 0.21 usec
s is None | 0.17 usec | 0.17 usec
crossed/.hg/store/00manifest.i
rev offset length base linkrev nodeid p1 p2
0 0 112 0 0 6f105cbb914d 000000000000 000000000000
1 112 56 1 3 1b55917b3699 000000000000 000000000000
2 168 123 1 1 8f3d04e263e5 000000000000 000000000000
3 291 122 1 2 f0ef8726ac4f 000000000000 000000000000
4 413 87 4 4 0b76e38b4070 000000000000 000000000000
crossed/.hg/store/data/012.i
rev offset length base linkrev nodeid p1 p2
0 0 3 0 0 b8e02f643373 000000000000 000000000000
1 3 3 1 1 5d9299349fc0 000000000000 000000000000
2 6 3 2 2 2661d26c6496 000000000000 000000000000
crossed/.hg/store/data/021.i
rev offset length base linkrev nodeid p1 p2
0 0 3 0 0 b8e02f643373 000000000000 000000000000
1 3 3 1 2 5d9299349fc0 000000000000 000000000000
2 6 3 2 1 2661d26c6496 000000000000 000000000000
crossed/.hg/store/data/102.i
rev offset length base linkrev nodeid p1 p2
0 0 3 0 1 b8e02f643373 000000000000 000000000000
1 3 3 1 0 5d9299349fc0 000000000000 000000000000
2 6 3 2 2 2661d26c6496 000000000000 000000000000
crossed/.hg/store/data/120.i
rev offset length base linkrev nodeid p1 p2
0 0 3 0 1 b8e02f643373 000000000000 000000000000
1 3 3 1 2 5d9299349fc0 000000000000 000000000000
2 6 3 2 0 2661d26c6496 000000000000 000000000000
crossed/.hg/store/data/201.i
rev offset length base linkrev nodeid p1 p2
0 0 3 0 2 b8e02f643373 000000000000 000000000000
1 3 3 1 0 5d9299349fc0 000000000000 000000000000
2 6 3 2 1 2661d26c6496 000000000000 000000000000
crossed/.hg/store/data/210.i
rev offset length base linkrev nodeid p1 p2
0 0 3 0 2 b8e02f643373 000000000000 000000000000
1 3 3 1 1 5d9299349fc0 000000000000 000000000000
2 6 3 2 0 2661d26c6496 000000000000 000000000000
crossed/.hg/store/data/manifest-file.i
rev offset length base linkrev nodeid p1 p2
0 0 3 0 3 b8e02f643373 000000000000 000000000000
1 3 3 1 4 5d9299349fc0 000000000000 000000000000
% Trying to strip revision 0
saving bundle to strip-backup/cbb8c2f0a2e3-backup
saving bundle to strip-backup/cbb8c2f0a2e3-temp
adding branch
adding changesets
adding manifests
adding file changes
added 4 changesets with 15 changes to 7 files (+3 heads)
% Verifying
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
7 files, 4 changesets, 15 total revisions
% Trying to strip revision 1
saving bundle to strip-backup/124ecc0cbec9-backup
saving bundle to strip-backup/124ecc0cbec9-temp
adding branch
adding changesets
adding manifests
adding file changes
added 3 changesets with 12 changes to 7 files (+3 heads)
% Verifying
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
7 files, 4 changesets, 14 total revisions
% Trying to strip revision 2
saving bundle to strip-backup/f6439b304a1a-backup
saving bundle to strip-backup/f6439b304a1a-temp
adding branch
adding changesets
adding manifests
adding file changes
added 2 changesets with 8 changes to 6 files (+2 heads)
% Verifying
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
7 files, 4 changesets, 14 total revisions
% Trying to strip revision 3
saving bundle to strip-backup/6e54ec5db740-backup
saving bundle to strip-backup/6e54ec5db740-temp
adding branch
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 2 files (+1 heads)
% Verifying
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
7 files, 4 changesets, 19 total revisions
% Trying to strip revision 4
saving bundle to strip-backup/9147ea23c156-backup
% Verifying
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
7 files, 4 changesets, 19 total revisions