Read the Python Handbook example A, b = B, a+b

The Python manual has an example for outputting a Fibonacci sequence within 10. The code is as follows:

1 A, b = 0, 12 while B <:3  print(b)4 C10/>a, B = B, a+b

Some Python features are used.

After the study explained

The first line, a, B = 0, and 1 assigns multiple variables. Equivalent A = 0, B = 1

Line Four, A, B = B, a+b, equivalent to a=b, B = a+b

Analyze the execution process

First cycle

A = 0, B = 1

Output b is 1 and calculated after a = 1,b = 1

Second cycle

Output B is 1,a = 1,b = 2

Read the Python Handbook example A, b = B, a+b