Hi can you please explain to me this code line by line

Question

def fib(n):
"""This is documentation string for function. It'll be available by fib.__doc__()
Return a list containing the Fibonacci series up to n."""
result = []
a = 1
b = 1
while a < n:
result.append(a)
tmp_var = b
b = a+b
a = tmp_var
return result
print(fib(10)

the result:
(1,1,2,3,5.8.13)
now i know this has been asked before but could anyone kind enough add a comment line by line what does it mean because i cant comprehend what does tmp_variable=b and then b=a+b and a=tmp_variable means. Could someone please tell me i need guidance on that

Answer 1

Actually, tmp_variable = b means that tmp_variable will be pointing to what b is pointing. If b is pointing 1, it will also be pointing 1.
b = a + b means that we are changing the value of b. Now, the value of b will be the value of a + the previous value of b.
Note that the value of tmp_variable is the old value of b only.
And a = tmp_variable means that now a is pointing to the value to which b was pointing before.