commit: look-up new revision once Look-up by node is slightly more expensive, so since it is necessary more than once, do it explicitly. Differential Revision: https://phab.mercurial-scm.org/D9830

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from __future__ import absolute_import

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import hashlib

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try:

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    from ..thirdparty import sha1dc

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    sha1 = sha1dc.sha1

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except (ImportError, AttributeError):

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    sha1 = hashlib.sha1