Problem with append list in loop

[michaelko03]

Here is my code

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import math import numpy as np   z = 0 y= [] x = []   while z < 5:     z = z + 1     t = 0     x.append([y])     while t < 8:         A = 10 + t         y.append(A)         t = t + z print (x)   I want to separate the result of y list in each cycle from the second while loop   I expect the result will be [10,11,12,13,14,15,16,17], [10,12,14,16],[10,13,16], [10,14], [10,15] [10,16]   but the outcome is [10,11,12,13,14,15,16,17,10,12,14,16,10,13,16,10,14,10,15,10,16 [10,11,12,13,14,15,16,17,10,12,14,16,10,13,16,10,14,10,15,10,16], [10,11,12,13,14,15,16,17,10,12,14,16,10,13,16,10,14,10,15,10,16], [10,11,12,13,14,15,16,17,10,12,14,16,10,13,16,10,14,10,15,10,16], [10,11,12,13,14,15,16,17,10,12,14,16,10,13,16,10,14,10,15,10,16]

can anyone help me? Thank you