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print() is a function in Python 3

See original GitHub issue

flake8 testing of https://github.com/chrisdonahue/wavegan on Python 3.6.3

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

./backup.py:19:40: E999 SyntaxError: invalid syntax
    print 'Waiting for first checkpoint'
                                       ^
./train_specgan.py:112:11: E999 SyntaxError: invalid syntax
  print '-' * 80
          ^
./train_wavegan.py:39:11: E999 SyntaxError: invalid syntax
  print '-' * 80
          ^
./data/count_tfrecord.py:40:9: E999 SyntaxError: invalid syntax
  print n
        ^
./data/preview_tfrecord.py:50:13: E999 SyntaxError: invalid syntax
    print '-' * 80
            ^
./data/ljspeech/split.py:36:15: E999 SyntaxError: invalid syntax
      print '-' * 80
              ^
./data/sc09/split.py:26:15: E999 SyntaxError: invalid syntax
      print '-' * 80
              ^
./eval/inception/score.py:147:35: E999 SyntaxError: invalid syntax
  print 'Inception score: {} +- {}'.format(mean, std)
                                  ^
./eval/inception/train.py:168:27: E999 SyntaxError: invalid syntax
        print 'Preview: {}'.format(latest_ckpt_fp)
                          ^
./eval/noise/noise.py:56:18: E999 SyntaxError: invalid syntax
  print '{} +- {}'.format(np.mean(X_weighted_mean), np.std(X_weighted_mean))
                 ^
./eval/similarity/sim.py:14:24: E999 SyntaxError: invalid syntax
  print 'Creating model'
                       ^
./web/bundle.py:19:16: E999 SyntaxError: invalid syntax
  print '{}->{}'.format(path, out_path)
               ^
12    E999 SyntaxError: invalid syntax
12