Max slice created by vetional - https://repl.it/MLrd/0

Max slice.py

from functools import reduce

def golden_max_slice(A):
  max_ending = max_slice = 0
  
  if all(a > 0 for a in A):
    return reduce((lambda x, y: x + y), A)
  if all(a < 0 for a in A):
    return max(A)
    
  for a in A:
    max_ending = max(0, max_ending + a)
    if max_ending > max_slice:
      max_slice = max_ending
      print (a, max_slice)
  
  return max_slice
  
A = [5, 2, -7, 3, 5, -2, 4, -1, 6]
print(golden_max_slice(A))