Use ==/!= to compare str, bytes, and int literals

[cclauss]

Use ==/!= to compare str, bytes, and int literals because identity is not the same thing as equality in Python. These instances will raise a SyntaxWarning on Python >= 3.8 so it is best to fix them now. https://docs.python.org/3.8/whatsnew/3.8.html#porting-to-python-3-8

flake8 testing of https://github.com/google/brain-tokyo-workshop on Python 3.7.1

$ flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics

./WANNRelease/prettyNeatWann/neat_train.py:58:6: F632 use ==/!= to compare str, bytes, and int literals
  if (gen%hyp['save_mod']) is 0:
     ^
./WANNRelease/prettyNeatWann/wann_train.py:58:6: F632 use ==/!= to compare str, bytes, and int literals
  if (gen%hyp['save_mod']) is 0:
     ^
./WANNRelease/prettyNeatWann/domain/make_env.py:62:5: F821 undefined name 'domain'
    domain.seed(seed)
    ^
./WANNRelease/prettyNeatWann/utils/utils.py:67:6: F632 use ==/!= to compare str, bytes, and int literals
  if sum(ratio) is not 1:
     ^
./WANNRelease/prettyNeatWann/utils/utils.py:96:7: F632 use ==/!= to compare str, bytes, and int literals
  if (len(A) is 0) or (len(B) is 0):
      ^
./WANNRelease/prettyNeatWann/utils/utils.py:96:24: F632 use ==/!= to compare str, bytes, and int literals
  if (len(A) is 0) or (len(B) is 0):
                       ^
./WANNRelease/prettyNeatWann/neat_src/neat_dataGatherer.py:46:8: F632 use ==/!= to compare str, bytes, and int literals
    if len(self.x_scale) is 0:
       ^
./WANNRelease/prettyNeatWann/neat_src/neat_dataGatherer.py:55:8: F632 use ==/!= to compare str, bytes, and int literals
    if len(self.best) is 0:
       ^
./WANNRelease/prettyNeatWann/neat_src/wann_ind.py:124:8: F632 use ==/!= to compare str, bytes, and int literals
    if choice is 1:
       ^
./WANNRelease/prettyNeatWann/neat_src/wann_ind.py:128:10: F632 use ==/!= to compare str, bytes, and int literals
    elif choice is 2:
         ^
./WANNRelease/prettyNeatWann/neat_src/wann_ind.py:132:10: F632 use ==/!= to compare str, bytes, and int literals
    elif choice is 3:
         ^
./WANNRelease/prettyNeatWann/neat_src/wann_ind.py:139:10: F632 use ==/!= to compare str, bytes, and int literals
    elif choice is 4:
         ^
./WANNRelease/prettyNeatWann/neat_src/wann_dataGatherer.py:42:8: F632 use ==/!= to compare str, bytes, and int literals
    if len(self.x_scale) is 0:
       ^
./WANNRelease/prettyNeatWann/neat_src/wann_dataGatherer.py:51:8: F632 use ==/!= to compare str, bytes, and int literals
    if len(self.best) is 0:
       ^
./WANNRelease/WANN/wann_train.py:57:6: F632 use ==/!= to compare str, bytes, and int literals
  if (gen%hyp['save_mod']) is 0:
     ^
./WANNRelease/WANN/wann_src/dataGatherer.py:42:8: F632 use ==/!= to compare str, bytes, and int literals
    if len(self.x_scale) is 0:
       ^
./WANNRelease/WANN/wann_src/dataGatherer.py:51:8: F632 use ==/!= to compare str, bytes, and int literals
    if len(self.best) is 0:
       ^
./WANNRelease/WANN/wann_src/_variation.py:352:6: F632 use ==/!= to compare str, bytes, and int literals
  if choice is 1:
     ^
./WANNRelease/WANN/wann_src/_variation.py:356:8: F632 use ==/!= to compare str, bytes, and int literals
  elif choice is 2:
       ^
./WANNRelease/WANN/wann_src/_variation.py:360:8: F632 use ==/!= to compare str, bytes, and int literals
  elif choice is 3:
       ^
./WANNRelease/WANN/wann_src/_variation.py:367:8: F632 use ==/!= to compare str, bytes, and int literals
  elif choice is 4:
       ^
./WANNRelease/WANN/domain/make_env.py:58:5: F821 undefined name 'domain'
    domain.seed(seed)
    ^
./WANNRelease/prettyNEAT/neat_train.py:58:6: F632 use ==/!= to compare str, bytes, and int literals
  if (gen%hyp['save_mod']) is 0:
     ^
./WANNRelease/prettyNEAT/domain/make_env.py:61:5: F821 undefined name 'domain'
    domain.seed(seed)
    ^
./WANNRelease/prettyNEAT/utils/utils.py:67:6: F632 use ==/!= to compare str, bytes, and int literals
  if sum(ratio) is not 1:
     ^
./WANNRelease/prettyNEAT/utils/utils.py:96:7: F632 use ==/!= to compare str, bytes, and int literals
  if (len(A) is 0) or (len(B) is 0):
      ^
./WANNRelease/prettyNEAT/utils/utils.py:96:24: F632 use ==/!= to compare str, bytes, and int literals
  if (len(A) is 0) or (len(B) is 0):
                       ^
./WANNRelease/prettyNEAT/neat_src/dataGatherer.py:46:8: F632 use ==/!= to compare str, bytes, and int literals
    if len(self.x_scale) is 0:
       ^
./WANNRelease/prettyNEAT/neat_src/dataGatherer.py:55:8: F632 use ==/!= to compare str, bytes, and int literals
    if len(self.best) is 0:
       ^
./WANNRelease/vae/vae.py:9:30: F821 undefined name 'sess'
  if 'sess' in globals() and sess:
                             ^
./WANNRelease/vae/vae.py:10:5: F821 undefined name 'sess'
    sess.close()
    ^
26    F632 use ==/!= to compare str, bytes, and int literals
5     F821 undefined name 'domain'
31