Pythonists

I am trying to understand the difference between

a = b
b = a + b
 and

a,b = b, a+ b
When used in my Fibonacci code the former generates 0,1,2,4,8,16,32 and the 
later
Generates 0,1,1,2,3,5,8,13,21,34,55,89.  The second is the sequence I want, but 
I would
Like to understand the second code sequence better so I can write the code in R 
and Scilab as well as python.
G

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