for chunk in chunker(range(25), 4):
    print(list(chunk))

[0, 1, 2, 3]
[4, 5, 6, 7]
[8, 9, 10, 11]
[12, 13, 14, 15]
[16, 17, 18, 19]
[20, 21, 22, 23]
[24]

def chunker(iterable, size):
    num = size
    for item in iterable:
       yield item,size


for chunk in chunker(range(25), 4):
    print(list(chunk))

[0, 4]
[1, 4]
[2, 4]
[3, 4]
[4, 4]
[5, 4]
[6, 4]
[7, 4]
[8, 4]
[9, 4]
[10, 4]
[11, 4]
[12, 4]
[13, 4]
[14, 4]
[15, 4]
[16, 4]
[17, 4]
[18, 4]
[19, 4]
[20, 4]
[21, 4]
[22, 4]
[23, 4]
[24, 4]

def chunker(iterable, size):
    for i in range(0, len(iterable), size): # percorremos o nosso range com um step de 4 neste caso, [0, 4, 8, 12, 16, 20, 24]
        yield iterable[i:i+size] # ficamos com os valores do nosso iteravel contidos no intervalo entre i e i+size, na primeira volta entre 0 e 0+4 ([0,1,2,3]) na segunda entre 4 e 4+4 ([4, 5, 6, 7]), etc...

c = chunker(list(range(25)), 4)
print(list(c)) # [[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11], [12, 13, 14, 15], [16, 17, 18, 19], [20, 21, 22, 23], [24]]

for i in chunker(list(range(25)), 4):
    print(i)