Hi, I decided to grab all the cols where there are 2 zeros and than choose col with smallest index as left most column
But i get error: "IndexError: list index out of range" . To me it is not clear. please advice:

def stone_wall(wall):
matrix = [list(x) for x in wall.splitlines()]
matrix = [col for col in matrix if len(col) != 0]
indexes=[]
weakest_places=[]
if '0' in wall:
for x in range(len(matrix)):
for y in range(len(matrix[x])):
if matrix[x][y] == '0':
indexes.append(y)
weakest_places = [x for x in indexes if indexes.count(x) ==2]
# remove duplicates
w_places=set(weakest_places)
weakest_places=list(w_places)
weakest_places.sort()
return weakest_places[0]
else:
return 0

Created at: Aug. 3, 2020, 11:07 a.m.; Updated at: Aug. 3, 2020, 4:13 p.m.

The question is resolved.