List element Zera after loop for

Question

I created an array and filled it with 100 [0] (because I don’t know a better way to do it) and after that I wanted to change these values using a loop for within another loop for. But what happens is that after the inside loop, when it comes out, all the values are reset again...

Here is the code (there are three prints there that you can see that inside the for it changes to the value I want but when the for, he goes back to being zero):

mediasCa = []

for k in range(0,itera):
    mediasCa.append(0)

for j in range(0,99):
    a = quant
    print(mediasCa[j])
    for i in range(0,itera):
        bola = randint(1,quant)
        if bola < a:
            a -= 1
        else:
            a += 1
    print(mediasCa[i])
    mediasCa[i] = mediasCa[i] + a
    print(mediasCa[i])

Answer 1

The error was syntax missing a TAB.

mediasCa = []    
for k in range(0,itera):
    mediasCa.append(0)
for j in range(0,99):
    aux = []
    a = quant
    for i in range(0,itera):
        bola = randint(1,quant)
        if bola < a:
            a -= 1
        else:
            a += 1
        mediasCa[i] = mediasCa[i] + a