Help me there..... It seems difficult to me.How does it work? Anyone explain it easily please. Here is the code below:

Question

a = 5
b = 7
print('a, b', a, b)
# swap these two
a = a + b
b = a - b
a = a - b
print('a, b', a, b)

Answer 1

See I will try to na u understand likewise:

1) firstly u gave 5 as a value to (a).
2) Then u gave 7 as a value to (b).
3) Then u used print statement to get the output as (a,b,5,7).
Here as first a and b are in the form of string so they will be printed as they are but after that u wrote (a,b) this will output the value which u gave them.
4) This is the comment.
5) Now u gave a as the value of a + b ( means 5+7) . Because of which now the value of a will be 12.
6) Now u gave b as the value of a - b ( means 12-7) . Because of which now the value of a will be 5.
7) Now u gave a as the value of a - b ( means 12-5) . Because of which now the value of a will be 7.
8)Then u used print statement to get the output as (a,b,7,5).

Now u can see that the values of a and b are interchanged.

Maybe this will help u out.

Answer 2

Do the math line by line.
There is nothing to be surprised.
Use the previous line value in the next line.

Answer 3

For swapping values:

a,b = b,a