Created temporary directory: /tmp/pip-ephem-wheel-cache-gypn_pjv
Created temporary directory: /tmp/pip-req-tracker-xmb3vq_f
Created requirements tracker '/tmp/pip-req-tracker-xmb3vq_f'
Created temporary directory: /tmp/pip-wheel-edzo0dze
Collecting backer==0.7.0
  1 location(s) to search for versions of backer:
  * https://pypi.org/simple/backer/
  Getting page https://pypi.org/simple/backer/
  Analyzing links from page https://pypi.org/simple/backer/
    Found link https://files.pythonhosted.org/packages/63/d3/5576a199568fe4b97f3e5d6a04ee304aeb0d1f60977a90ecc210974e2d22/backer-0.7.0-py3-none-any.whl#sha256=958064ab03ee2e3f419895e379ed52f73315b0cad45351c1f75181ca28094172 (from https://pypi.org/simple/backer/), version: 0.7.0
    Found link https://files.pythonhosted.org/packages/d4/91/0209f0bd5bbb899d4ee45fbdd4dd5d220a0569e2d508e469d637f6c16023/backer-0.7.0.tar.gz#sha256=ae0336c0c6e81a7d7236ec9e80eb06d1604f6f39e4675e7319019367ba8f81ae (from https://pypi.org/simple/backer/), version: 0.7.0
  Using version 0.7.0 (newest of versions: 0.7.0)
  Created temporary directory: /tmp/pip-unpack-9cqvqivf
  Downloading https://files.pythonhosted.org/packages/63/d3/5576a199568fe4b97f3e5d6a04ee304aeb0d1f60977a90ecc210974e2d22/backer-0.7.0-py3-none-any.whl
  Downloading from URL https://files.pythonhosted.org/packages/63/d3/5576a199568fe4b97f3e5d6a04ee304aeb0d1f60977a90ecc210974e2d22/backer-0.7.0-py3-none-any.whl#sha256=958064ab03ee2e3f419895e379ed52f73315b0cad45351c1f75181ca28094172 (from https://pypi.org/simple/backer/)
  Saved /tmp/tmpeflm2d9b/backer-0.7.0-py3-none-any.whl
  Added backer==0.7.0 from https://files.pythonhosted.org/packages/63/d3/5576a199568fe4b97f3e5d6a04ee304aeb0d1f60977a90ecc210974e2d22/backer-0.7.0-py3-none-any.whl#sha256=958064ab03ee2e3f419895e379ed52f73315b0cad45351c1f75181ca28094172 to build tracker '/tmp/pip-req-tracker-xmb3vq_f'
  Removed backer==0.7.0 from https://files.pythonhosted.org/packages/63/d3/5576a199568fe4b97f3e5d6a04ee304aeb0d1f60977a90ecc210974e2d22/backer-0.7.0-py3-none-any.whl#sha256=958064ab03ee2e3f419895e379ed52f73315b0cad45351c1f75181ca28094172 from build tracker '/tmp/pip-req-tracker-xmb3vq_f'
Skipping backer, due to already being wheel.
Cleaning up...
  Removing source in /tmp/pip-wheel-edzo0dze/backer
Removed build tracker '/tmp/pip-req-tracker-xmb3vq_f'