print() is a function in Python 3

[cclauss]

flake8 testing of https://github.com/tensorflow/magenta on Python 3.7.0

$ flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics

./magenta/video/next_frame_prediction_pix2pix/join_pairs.py:88:38: E999 SyntaxError: invalid syntax
  print 'looking for recursive img in', path
                                     ^
./magenta/video/tools/convert2jpg.py:79:34: E999 SyntaxError: invalid syntax
  print 'looking for all files in', path
                                 ^
./magenta/video/tools/random_pick.py:67:61: E999 SyntaxError: invalid syntax
    print 'path in == path out, that is not allowed, quiting'
                                                            ^
./magenta/video/tools/extract_frames.py:130:28: E999 SyntaxError: invalid syntax
  print 'argument to expand', ARGS.video_in
                           ^
4     E999 SyntaxError: invalid syntax
4

[cghawthorne]

FYI, @dh7