https://www.programiz.com/python-programming/list-comprehension
Folds => functools.reduce(func, seq)
https://wiki.python.org/moin/PythonSpeed/PerformanceTips#Loops
https://www.programiz.com/python-programming/list-comprehension
Folds => functools.reduce(func, seq)
https://wiki.python.org/moin/PythonSpeed/PerformanceTips#Loops