Need help understanding this statement

[Celtrix]

Yes i realize this is the fibonacci sequence and i understand the math im just having trouble understanding the line in red what does it equate to in laymans terms?
Thanks in advance :D

a,b=0,1
while b < 100:
  print b
  a,b=b,a+b

[Soup Or Sonic]

It's setting a equal to b, and b equal to a+b.

Achieved by this as well:

a = 0
b = 1
while b < 100:
print b
a = b
b=a+b

They just used some short hand statements.

This :

num1,num2 = 12,72

Is the same thing as :

num1 = 12
num2 = 72

[Celtrix]

Oh thanks :D

[Celtrix]

Hmm it spits out doubles when i do that instead of the fibonacci sequence any ideas?

[TrustyTony]

Traditional way to do this is by temporary variable, because we need the old value of b in two formulas on the right side. Let's call the temporary variable new_b:

a,b=0,1
while b < 100:
  print b
  new_b = a + b
  a = b
  b = new_b

alternatively you can become clever and deside that it does not matter to destroy old value of b as the new value is a+b and the old b is a+b-a:

a,b=0,1
while b < 100:
  print b
  b = a + b
  a = b - a

Best way of course is the original Pythonic double assignment, where right hand values have the old variable values before the assignments.

[Celtrix]

Thanks for clearing that up and all the help guys :D