legacy: rename lookup_errors to not be in all caps (flake8 warning)
flake8 has a plugin, pep8-naming, which is not installed by default, but is
used if available, no extra config required. This plugin checks names of
variables, classes, functions and so on against PEP-8, and it complained about
this variable:
N806 variable in function should be lowercase
Since this isn't a module-level constant, but just a helper variable used only
in one function, it's fine to just rename it.
With this error gone, flake8 output (used plugins: mccabe, naming, pycodestyle,
pyflakes) is totally clean.
syntax: re
/figures/[^/]+\.png$
^html/
\.pyc$
~$
\.swp$
\.orig$
\.rej$
\.err$
^tests/easy_run.sh$
^build/
^dist/
^MANIFEST$
^docs/tutorials/.*\.rst$
\.ico$
tests/\.testtimes