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x = [1, 2, 3]
y = x
x[1] = 'AB'
y[1] = y[1][0]
print(x, y)
>>>
[1, 'A', 3] [1, 'A', 3]
We assign ‘AB’ value to index 1 for x list so y list gets this value as well. Then we assign y[1][0] value to y[1], but what does y[1][0] notation mean?
y[1]is the second item from your list, that is ‘AB’ which is a string. As strings allow you to access its values with indexes,y[1][0]is just the first item from the string ‘AB’, that is ‘A’.See this for an introduction to Python’s strings and slice notation.