WeiZhong94 commented on issue #9140: [FLINK-13299][travis][python] fix flink-python failed on Travis because of incompatible virtualenv URL: https://github.com/apache/flink/pull/9140#issuecomment-512225744 @zentol Thanks a lot for your review. The reason is that virtualenv 16.6.2 released on 2019-07-14 is incompatible with python 2.7 and python 3.4. I have fixed this issue by using version 16.0.0 which is the latest stable version in conda-forge.
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