Undefined names in Python code

[cclauss]

flake8 testing of https://github.com/ddbourgin/numpy-ml on Python 3.7.1

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

./numpy_ml/rl_models/trainer.py:75:61: F821 undefined name 'smooth_tot'
            smooth_tot = tot_rwd if ep == 0 else (1 - sf) * smooth_tot + sf * tot_rwd
                                                            ^
./numpy_ml/neural_nets/models/w2v.py:303:38: F821 undefined name 'smooth_loss'
                smooth_loss = 0.99 * smooth_loss + 0.01 * loss if ix > 0 else loss
                                     ^
./numpy_ml/neural_nets/layers/layers.py:1845:14: F632 use ==/!= to compare str, bytes, and int literals
        elif self.pool is "sum":
             ^
./numpy_ml/neural_nets/layers/layers.py:1848:14: F632 use ==/!= to compare str, bytes, and int literals
        elif self.pool is "mean":
             ^
2     F632 use ==/!= to compare str, bytes, and int literals
2     F821 undefined name 'smooth_loss'
4

E901,E999,F821,F822,F823 are the "showstopper" flake8 issues that can halt the runtime with a SyntaxError, NameError, etc. These 5 are different from most other flake8 issues which are merely "style violations" -- useful for readability but they do not effect runtime safety.

• F821: undefined name name
• F822: undefined name name in __all__
• F823: local variable name referenced before assignment
• E901: SyntaxError or IndentationError
• E999: SyntaxError -- failed to compile a file into an Abstract Syntax Tree