Whats the use of number=3. It works without using it.

Answer 1

Sagar Gyanchandani
Let me explain you the whole code.

# initialization number=3
* initialization of list named as "things"
things=["string",0,[1,2,number],4.56]
* Now where you have typed number in the list . There it will take 3
things=["string",0,[1,2,3],4.56]

Now output time :
print(things[1])
#prints 2nd elements which has index 1 = 0
print(things[2])
#prints 3rd element which has index 2 = [1,2,3]
print(things[2][2])
#prints the 3rd element of 3rd element = 3
I.e. 3rd element of [1,2,3] = 3

You can put 3 instead of number and then you do need to initialize the value of number.
Thanks

Answer 2

You can think variable name as a key or a link to it's value.
When
number = 3
And
things = ["string", 0, [1, 2, number], 4.56]

number in the sublist of things. Searches the number's variable, which was 3.
Thus when ever you use things, it is just:
things = ["string", 0, [1, 2, 3]]

Answer 3

number = 3
things = ["string", 0, [1, 2, number], 4.56]
print(things[1])
print(things[2])
print(things[2][2])

Answer 4

Thanks bro..