When it comes to updating the existing variable, we need to re-assign it after updating its value,
a = a + 1
It gets the current value of a, adds 1, and then updates a with the new value.
If we try to increase or decrease the value of a variable that is not yet assigned any value i.e. it doesn't exist, you get an error, because Python evaluates the right side before it assigns a value to a.
Therefore, before increasing or decreasing the value, we need to initialize the variable,
a = 0
a = a + 1
a = a - 1
a = a * 2
a = a // 3
Try updating a random variable which hasn't been initialized and observe the error.
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