yexu15 179b384e39 A fix regarding the compatibility with python 2.6 (#1981)
* A fix regarding the compatibility with python 2.6

the syntax of {n: self.attr(n) for n in attr_names} is illegal in python 2.6

* Update core.py

add a space after comma
2017-01-29 20:18:28 -08:00
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2016-07-29 11:23:06 -07:00