2019-07-01T22:51:29 Created temporary directory: /tmp/pip-ephem-wheel-cache-8ntrwhi8
2019-07-01T22:51:29 Created temporary directory: /tmp/pip-req-tracker-1xl4wg6k
2019-07-01T22:51:29 Created requirements tracker '/tmp/pip-req-tracker-1xl4wg6k'
2019-07-01T22:51:29 Created temporary directory: /tmp/pip-wheel-cfdtdw5m
2019-07-01T22:51:29 Collecting lback==0.0.1
2019-07-01T22:51:29   1 location(s) to search for versions of lback:
2019-07-01T22:51:29   * https://pypi.org/simple/lback/
2019-07-01T22:51:29   Getting page https://pypi.org/simple/lback/
2019-07-01T22:51:29   Analyzing links from page https://pypi.org/simple/lback/
2019-07-01T22:51:30     Found link https://files.pythonhosted.org/packages/11/5f/6e9ca721ea670d7f3bad755a69fd2e51183bf60fa632471c44db1556ce1b/lback-0.8.1.zip#sha256=4236b0b2a8d81af8ca10b1cabd06fcd7e8939f3866a1e8f847b054eb1ad035c4 (from https://pypi.org/simple/lback/), version: 0.8.1
2019-07-01T22:51:30   ERROR: Could not find a version that satisfies the requirement lback==0.0.1 (from versions: 0.8.1)
2019-07-01T22:51:30 Cleaning up...
2019-07-01T22:51:30 Removed build tracker '/tmp/pip-req-tracker-1xl4wg6k'
2019-07-01T22:51:30 ERROR: No matching distribution found for lback==0.0.1
2019-07-01T22:51:30 Exception information:
2019-07-01T22:51:30 Traceback (most recent call last):
2019-07-01T22:51:30   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/cli/base_command.py", line 178, in main
2019-07-01T22:51:30     status = self.run(options, args)
2019-07-01T22:51:30   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/commands/wheel.py", line 164, in run
2019-07-01T22:51:30     resolver.resolve(requirement_set)
2019-07-01T22:51:30   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/resolve.py", line 131, in resolve
2019-07-01T22:51:30     self._resolve_one(requirement_set, req)
2019-07-01T22:51:30   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/resolve.py", line 294, in _resolve_one
2019-07-01T22:51:30     abstract_dist = self._get_abstract_dist_for(req_to_install)
2019-07-01T22:51:30   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/resolve.py", line 242, in _get_abstract_dist_for
2019-07-01T22:51:30     self.require_hashes
2019-07-01T22:51:30   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/operations/prepare.py", line 282, in prepare_linked_requirement
2019-07-01T22:51:30     req.populate_link(finder, upgrade_allowed, require_hashes)
2019-07-01T22:51:30   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/req/req_install.py", line 198, in populate_link
2019-07-01T22:51:30     self.link = finder.find_requirement(self, upgrade)
2019-07-01T22:51:30   File "/usr/local/lib/python3.7/dist-packages/pip/_internal/index.py", line 792, in find_requirement
2019-07-01T22:51:30     'No matching distribution found for %s' % req
2019-07-01T22:51:30 pip._internal.exceptions.DistributionNotFound: No matching distribution found for lback==0.0.1