🔒 Simple function

[hollow geode]

Hello i have to do a function. I try something but it doesn't work so i ask for help please.
Here are the instructions :
Write a max_and_index function that takes a non-empty array tab
(Python type list) of integers and returns the value of the largest element of theand the index of its first appearance in the array.
Use of the native max function is not permitted.
Examples:

max_and_index([1, 5, 6, 9, 1, 2, 3, 7, 9, 8])
(9, 3)

max_and_index([-2])
(-2, 0)
max_and_index([-1, -1, 3, 3, 3])
(3, 2)
max_and_index([1, 1, 1, 1])
(1, 0)
Also i post what i tried.

[lean spear]

@hollow geode

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[solid spear]

it's tab[i] not i[tab]

and you didn't define valeur_maxi

as for some suggestions,
• try looking into the enumerate() function.
• Pass through all the elements,
don't stop at the first larger element.

[hollow geode]

Okay thank u

[turbid briar]

If valeur maxi < tab[i]:
valeur maxi = tab[i]
indice max =i

[hollow geode]

?

[turbid briar]

That's how you make valeur maxi the largest value

Also if len(tab) == 0:
return None # according to your question

[solid spear]

@hollow geode utilizing the latter, you'd get something like this -

def max_index(tab):
   i_max, v_max = 0, tab[0]

   for i, v in enumerate(tab):
      if v > v_max:
          i_max, v_max = i, v

   return (i_max, v_max)

[solid spear]

there's no need for len() or return None. this could be shortened to -

if not tab:
   return

[hollow geode]

thank you but i cant use functions like enumerate

if i want to enumerate i have to make a for i in ...

[turbid briar]

Replace that with for i in len(tab) then

[solid spear]

range() could also work; though you'd need to get the element separately.
like-

for i in range(len(tab)):
   v = tab[i]
   ...

[turbid briar]

Yes he is correct you need range

[hollow geode]

Finally i find the problem thank you

[lean spear]

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