Python arrays：为什么是 output 3

Question

Can someone explain me why the output of the variable a is 3?

a = [4,3,1][1]

(Output) 3

Answer 1

You are selecting the first (array count starts at 0) element of your array [4, 3, 1], which is 3.

Answer 2

To be easier to understand, think of that line of code as split into two:

list = [4,3,1]
a = list[1]

You are indexing the 1st position (indexing starts at 0), which is the value 3 in the list you defined.

Answer 3

You are defining an array [4, 3, 1] . By writing [1] you are selecting the second element of this array (the arrays in python start from 0). So a equals to the second element of array - 3. If you write [0] or [2] you get 4 or 1 accordingly.