# Pastebin aiYBemgu
generate-constraints -p /usr/bin/python2.7 -p /usr/bin/python3.4       -b blacklist.txt -r global-requirements.txt > baseline
Traceback (most recent call last):
  File "/usr/local/bin/generate-constraints", line 10, in <module>
    sys.exit(main())
  File "/home/ubuntu/requirements/openstack_requirements/cmds/generate.py", line 181, in main
    _freeze(options.requirements, python) for python in options.pythons]
  File "/home/ubuntu/requirements/openstack_requirements/cmds/generate.py", line 89, in _freeze
    % ('\n'.join(output), exc))
Exception: Failed to generate freeze: Python 2.7.6
 [Errno 2] No such file or directory