made set_write_concern python2.7 compatible
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@ -221,6 +221,6 @@ class query_counter(object):
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@contextmanager
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@contextmanager
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def set_write_concern(collection, write_concerns):
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def set_write_concern(collection, write_concerns):
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yield collection.with_options(write_concern=WriteConcern(
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old_concerns = dict(collection.write_concern.document.items())
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**dict(collection.write_concern.document.items()),
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combined_concerns = old_concerns.update(write_concerns)
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**write_concerns))
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yield collection.with_options(write_concern=WriteConcern(**combined_concerns))
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