Created temporary directory: /tmp/pip-ephem-wheel-cache-kjsf93bf
Created temporary directory: /tmp/pip-req-tracker-4160ampg
Created requirements tracker '/tmp/pip-req-tracker-4160ampg'
Created temporary directory: /tmp/pip-wheel-d36s2d80
Collecting virtualenv==16.3.0
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  Getting page https://pypi.org/simple/virtualenv/
  Analyzing links from page https://pypi.org/simple/virtualenv/
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