[compat] Replace deficient ChainMap class in Py3.3 and earlier
* fix version check
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@ -3005,7 +3005,7 @@ except ImportError:
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try:
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from collections import ChainMap as compat_collections_chain_map
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# Py3.3's ChainMap is deficient
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if sys.version_info <= (3, 3):
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if sys.version_info < (3, 4):
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raise ImportError
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except ImportError:
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# Py <= 3.3
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