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__get_norm()__ is called on lines 259 and 265 but it is never imported or defined. [flake8](http://flake8.pycqa.org) testing of https://github.com/3b1b/manim on Python 3.7.0 $ __flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics__ ``` ./old_projects/bell.py:222:38: E999 SyntaxError: invalid syntax for here, x in (here1, 0), (here2, 4) ^ ./old_projects/borsuk.py:217:11: E999 SyntaxError: invalid syntax y=lambda m: m1.get ^ ./old_projects/eoc/chapter6.py:399:35: E999 SyntaxError: invalid syntax for i, j in (1, 0), (0, 1) ^ ./old_projects/nn/network.py:258:16: F821 undefined name 'get_norm' norm = get_norm(gradient) ^ ./old_projects/nn/network.py:264:15: F821 undefined name 'get_norm' print(get_norm(old_pre_sig_guess - pre_sig_guess)) ^ 3 E999 SyntaxError: invalid syntax 2 F821 undefined name 'get_norm' 5 ```