Difference between writing something on one line and on several lines

Question

Where is the difference when I write something on one line, seperated by a , and on two lines. Apparently I do not understand the difference, because I though t

Answer 1

The difference is because in the second example you set a to b before referencing a. Your values on the second example will be off. Here is an example:

a = 5
b = 6

ex.1:

a, b = b, a+b // a = 6 and b = 11

ex.2:

a = b // a = 6
b = a + b // b = 6+6 or 12

The first example is correct