Today I noticed, I couldn't copy a list. Nor using .copy() method, nor slicing. It always refered to both of lists.
I worked around by creating same list by list comprehension but for some reason common methods didn't work.
Could you explain why my code didn't work correctly with copy() / slicing?
Note: 2 lists differ with contents but it shouldn't matter because my plan was to change every item of them based on conditions written later in the program.
def find_next_gen(generation):
generation2 = [['.' for x in range(n)] for x in range(m)]
# generation2 = generation1[:] <- didn't work
# generation2 = generation1.copy() <- didn't work
for i, row in enumerate(generation1):
for j, element in enumerate(row):
# checking alive_neighbours:
alive_neighbours = 0
# same row:
alive_neighbours += check(generation1[i][j - 1] if j != 0 else generation1[i][-1])
alive_neighbours += check(generation1[i][j + 1] if j != n - 1 else generation1[i][0])
# row above:
if i == 0:
row_num_above = -1
else:
row_num_above = i - 1
alive_neighbours += check(generation1[row_num_above][j - 1] if j != 0 else generation1[row_num_above][-1])
alive_neighbours += check(generation1[row_num_above][j])
alive_neighbours += check(generation1[row_num_above][j + 1] if j != n - 1 else generation1[row_num_above][0])
# row beneath:
if i == m - 1:
row_num_beneath = 0
else:
row_num_beneath = i + 1
alive_neighbours += check(generation1[row_num_beneath][j - 1] if j != 0 else generation1[row_num_beneath][-1])
alive_neighbours += check(generation1[row_num_beneath][j])
alive_neighbours += check(generation1[row_num_beneath][j + 1] if j != n - 1 else generation1[row_num_beneath][0])
# create new generation:
if generation1[i][j] == 'X' and 3 >= alive_neighbours >= 2 or generation1[i][j] == '.' and alive_neighbours == 3:
generation2[i][j] = 'X'
else:
generation2[i][j] = '.'
return generation2
