Can anyone help me? I don't understand loops

Question

https://code.sololearn.com/cDR5svhfof00/?ref=app
https://www.sololearn.com/learn/JUMP_LINK__&&__Python__&&__JUMP_LINK/2435/?ref=app
I try a lot but i am still confused. I don't understand this lesson.
(I will appreciate if anyone can explain this to me as simple as he/she can.)

Answer 1

words = ["hello", "world", "spam", "eggs"]
counter = 0
max_index = len(words) - 1

The first element in words starts at index 0:
words [0] = "hello";
...
words [3] = "eggs"

The length of words is 4, because it contains 4 elements.
Now it should be clear why max_index = len (words) - 1
= 4 - 1 = 3

while counter <= max_index:
This is your condition. The loop runs until counter <= max_index. If the counter gets larger the loop stops.

word = words[counter]
print(word + "!")
counter = counter + 1

counter = 0 -> word = words [0] = "hello"
print hello!
increment counter

counter = 1 -> word = words [1] = "world"
print world!
increment counter

and so on...

counter gets 4 -> larger than max_index -> stop loop

As you can see the loop prints all elements of your list.

Answer 2

Denise Roßberg really thank you!

Answer 3

Elen V Your welcome :)

Answer 4

Loops :
In your code:
words = ["hello", "world", "spam", "eggs"]
counter = 0
max_index = len(words) - 1

while counter <= max_index:
word = words[counter]
print(word + "!")
counter = counter + 1

You are saying to the program while counter(is 0) is less than or equal to max index(length of the array words note : the tru e length of the array is 4 but in this example is 3 simply because the array start counting from 0 )
Print word +!
Where word is the array words with the number counter inside it.

Counter = counter + 1

Means in every value of counter returns it value and add 1 to it ex
If counter = 2
The loop will start counting from 2 to the end
Of the loop

The end of loop ex

While number<=number2

Number:beginning of the loop
Number2:the end of the loop

You can reverse the loop

While number>=number2
Bla Bla
Number = number -1

Hope this explanation will help you 😊
Peace

Answer 5

Moumen Al_Bakkar 😂😂 sorry
Thank you too

Answer 6

Loops are used to repeat code segments.

Answer 7

Hope you understand now.

Answer 8

$p@rK thanks 👍

Answer 9

You are welcome 😊

Answer 10

No need to thank me.

Answer 11

Sonic 👍

Answer 12

if you want to write your name one time u can write (in C#) { Console.WriteLine("Elen"); }
if you want to write it twise you can copy and paste last line...
But how about 100 times ?
or 1000 ?
do u want to copy paste copy past......
OF COURSE no..
so we have to use loop sometimes to repeat things without wasting time.

Answer 13

Elen V why didn't u thank me 😐

Answer 14

Sonic, yes now i understand and i want to thank you all of you 🤗

Answer 15

I can try it to explain in pseudocode.

You got a kind of data.
Lets say a list.

ex_list = [1,2,3,4]

And you want to do something with every elenent of the data, then you say:
for [each] element in .

The tool is

for i in ex_list:
do something.

Hope it helps.