Variable assignment in expressions

Question

Here is my code to generate values in the fibonnacci sequence below 10,000,000.

  3 fibs = [1,1]
  4 while((x = fibs[-1] + fibs[-2]) <= 10000000):
  5             


        

Answer 1

Basically:

fibs = [1]
x = 1

while(x <= 10000000):
  fibs.append(x)
  # It is not possible for "fibs" not to have
  # at least two elements by now
  x = fibs[-1] + fibs[-2]

(It was, in fact, one of the design goals of Python to avoid mixing expressions and assignments like C — that's why there's no x++, x--, which is also a semi-FAQ.)