Requesting a destination variable in python

Question

I am writing Fibonacci code in python. The solution below is mine.

While the other solution is below from python.org.

Can someone tell me why it gives a different answer, although the logic for assigning variables is the same?

Answer 1

These two programs are not equivalent. The right-hand side of equalities ( =) is evaluated together. Performance:

a=b
b=a+b

Differs from:

a,b = b,a+b

This is actually the same as:

c = a
a = b
b = b + c

Your example is indeed described in the Python documentation :

: a b 0 1. , , . .

Answer 2

a = b # Assigns the value of 'b' to 'a'
b = a + b # Adds the new value of 'a' to 'b'

,

a, b = b, a+b b a. a b.

Answer 3

, , , a=b , . , b=a+b, a . a . python, , . , . , , .

Answer 4

I see additional tabs in your solution, and also the logic of your program is incorrect. As I understand it, writing fib(5), you need the 5th Fibonacci in the series (5), and not a number that is less than 5 (this is 3).

a=b
b=a+b

and

a,b = b,a+b

not equal.

Take a look at the code below.

def fibonacci(num):
    a,b=0,1;
    counter = 2;
    while(a<=):
        a,b = b,a+b
        counter += 1
    return b

print fibonacci(5)