```src/python/pants/backend/python/tasks/pytest_ru...
# development
r
Copy code
src/python/pants/backend/python/tasks/pytest_run.py
86:    PythonRequirement('unittest2', version_filter=lambda py, pl: py.startswith('2')),
87:    PythonRequirement('unittest2py3k', version_filter=lambda py, pl: py.startswith('3’))