Traceback (most recent call last):
  File "/usr/bin/pyflakes", line 5, in <module>
    main(sys.argv[1:])
  File "/usr/lib/python2.7/dist-packages/pyflakes/scripts/pyflakes.py", line 94, in main
    warnings += check(sys.stdin.read(), '<stdin>')
  File "/usr/lib/python2.7/dist-packages/pyflakes/scripts/pyflakes.py", line 28, in check
    tree = compile(codeString, filename, "exec", _ast.PyCF_ONLY_AST)
TypeError: compile() expected string without null bytes