Consider MatRepr for __repr__ instead of Pandas #494

https://pypi.org/project/matrepr/

Benefits:

• output looks like a matrix, not a dataframe
• faster, especially on first run where the pandas import is slow
• small code

See it in action with python-graphblas:
https://nbviewer.org/github/alugowski/matrepr/blob/main/doc/demo-python-graphblas.ipynb

To try yourself, use matrepr's jupyter integration (causes Jupyter to use matrepr's formatter instead of the native one):

import matrepr.jupyter

For the Python REPL, a __repr__ monkey patch does the same:

import matrepr.patch.graphblas