var /= 3 * 2 is the same as
var = var / (3 * 2), as when using
/=, Python would divide the variable on the left, with the value on the right, which can be simplified to
var = var / 6.
var = var / 3 * 2, since there are no brackets at all (otherwise Python would evaluate the value inside the bracket first, like normal mathematical operations), so Python would just evaluate from left to right. So
var = var / 3 * 2 can be simplified to
var = 2 * 2 (var = 6 and 6 / 3 = 2), which will then be simplified to
var = 4.0 , as 2 multiplied by 2 is 4.
To summarise, /= divides the var on the left by the final value on the right, while
var = var / 3 * 2 will be evaluated from left to right since there are no brackets. If you bracket
3 * 2 you will find that
var = 1.0 now. Hope this was clear.