error

python3 -m flake8 scripts/copyright/copyright.py       
Traceback (most recent call last):
  File "/usr/lib/python3.4/runpy.py", line 170, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.4/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/usr/local/lib/python3.4/dist-packages/flake8/__main__.py", line 1, in <module>
    from flake8.main import main
  File "/usr/local/lib/python3.4/dist-packages/flake8/main.py", line 7, in <module>
    from flake8.engine import get_parser, get_style_guide
  File "/usr/local/lib/python3.4/dist-packages/flake8/engine.py", line 5, in <module>
    import pep8
ImportError: No module named 'pep8'