Previously those classes were pretty printed using long Unicode symbols,
which worked erratically on different terminals. This commit uses more
standard characters.
Things are now printed like this:
```
{g∘f:A₁——▶C₁: ∅, id:A₁——▶A₁: ∅, id:B——▶B: ∅, id:C₁——▶C₁: ∅, f:A₁——▶B: ∅,
g:B——▶C₁: ∅}
══▶ {g∘f:A₁——▶C₁: {unique}}
```
Thanks to @asmeurer for the suggestion!
You can merge this Pull Request by running:
git pull https://github.com/scolobb/sympy long-unicode-arrows
Or you can view, comment on it, or merge it online at:
https://github.com/sympy/sympy/pull/1440
-- Commit Summary --
* Fix long arrows in Unicode pretty printing of category theoretic classes.
-- File Changes --
M sympy/printing/pretty/pretty.py (4)
M sympy/printing/pretty/tests/test_pretty.py (16)
-- Patch Links --
https://github.com/sympy/sympy/pull/1440.patch
https://github.com/sympy/sympy/pull/1440.diff
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