Created temporary directory: /tmp/pip-ephem-wheel-cache-2rlsk0d2
Created temporary directory: /tmp/pip-req-tracker-gtagsh6v
Created requirements tracker '/tmp/pip-req-tracker-gtagsh6v'
Created temporary directory: /tmp/pip-wheel-ydfhfy5v
Collecting mattrs==0.0.0
  1 location(s) to search for versions of mattrs:
  * https://pypi.org/simple/mattrs/
  Getting page https://pypi.org/simple/mattrs/
  Analyzing links from page https://pypi.org/simple/mattrs/
    Found link https://files.pythonhosted.org/packages/e4/6b/ee2dccc3de7a4631c867fcb29acdf79f6b0e069f474348e00c3dc8f4d6e9/mattrs-0.0.0-py2.py3-none-any.whl#sha256=e7ab8550cbe2065d7d2d161b7b03ac212bcda0e713ac94b3962f19cf6f0ccc86 (from https://pypi.org/simple/mattrs/), version: 0.0.0
    Found link https://files.pythonhosted.org/packages/f8/94/bdd47d156125305562b2a014871dba97a519d2a0684526288e5022bc8e24/mattrs-0.0.0.tar.gz#sha256=e612812241da960f42ffb58a81854b85e04bfbe9e24ce2f96ac30b8b29c73f8e (from https://pypi.org/simple/mattrs/), version: 0.0.0
  Using version 0.0.0 (newest of versions: 0.0.0)
  Created temporary directory: /tmp/pip-unpack-lc7xjdkz
  Downloading https://files.pythonhosted.org/packages/e4/6b/ee2dccc3de7a4631c867fcb29acdf79f6b0e069f474348e00c3dc8f4d6e9/mattrs-0.0.0-py2.py3-none-any.whl
  Downloading from URL https://files.pythonhosted.org/packages/e4/6b/ee2dccc3de7a4631c867fcb29acdf79f6b0e069f474348e00c3dc8f4d6e9/mattrs-0.0.0-py2.py3-none-any.whl#sha256=e7ab8550cbe2065d7d2d161b7b03ac212bcda0e713ac94b3962f19cf6f0ccc86 (from https://pypi.org/simple/mattrs/)
  Saved /tmp/tmpibwytfy3/mattrs-0.0.0-py2.py3-none-any.whl
  Added mattrs==0.0.0 from https://files.pythonhosted.org/packages/e4/6b/ee2dccc3de7a4631c867fcb29acdf79f6b0e069f474348e00c3dc8f4d6e9/mattrs-0.0.0-py2.py3-none-any.whl#sha256=e7ab8550cbe2065d7d2d161b7b03ac212bcda0e713ac94b3962f19cf6f0ccc86 to build tracker '/tmp/pip-req-tracker-gtagsh6v'
  Removed mattrs==0.0.0 from https://files.pythonhosted.org/packages/e4/6b/ee2dccc3de7a4631c867fcb29acdf79f6b0e069f474348e00c3dc8f4d6e9/mattrs-0.0.0-py2.py3-none-any.whl#sha256=e7ab8550cbe2065d7d2d161b7b03ac212bcda0e713ac94b3962f19cf6f0ccc86 from build tracker '/tmp/pip-req-tracker-gtagsh6v'
Skipping mattrs, due to already being wheel.
Cleaning up...
  Removing source in /tmp/pip-wheel-ydfhfy5v/mattrs
Removed build tracker '/tmp/pip-req-tracker-gtagsh6v'