Mercurial > public > mercurial-scm > hg
comparison mercurial/util.py @ 14942:5b072d4b62f2
safehasattr: new function to work around hasattr being broken
| author | Augie Fackler <durin42@gmail.com> |
|---|---|
| date | Mon, 25 Jul 2011 14:59:55 -0500 |
| parents | 2aa3e07b2f07 |
| children | b7dbe957585c |
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| 14941:4a28cb4df1f8 | 14942:5b072d4b62f2 |
|---|---|
| 73 # Python compatibility | 73 # Python compatibility |
| 74 | 74 |
| 75 def sha1(s): | 75 def sha1(s): |
| 76 return _fastsha1(s) | 76 return _fastsha1(s) |
| 77 | 77 |
| 78 _notset = object() | |
| 79 def safehasattr(thing, attr): | |
| 80 return getattr(thing, attr, _notset) is not _notset | |
| 81 | |
| 78 def _fastsha1(s): | 82 def _fastsha1(s): |
| 79 # This function will import sha1 from hashlib or sha (whichever is | 83 # This function will import sha1 from hashlib or sha (whichever is |
| 80 # available) and overwrite itself with it on the first call. | 84 # available) and overwrite itself with it on the first call. |
| 81 # Subsequent calls will go directly to the imported function. | 85 # Subsequent calls will go directly to the imported function. |
| 82 if sys.version_info >= (2, 5): | 86 if sys.version_info >= (2, 5): |