CODEWITHSUNDEEP
pythonpython-3.xlist
Boris BELLOC
Boris BELLOC

Reputation: 196

How to display in which position a number was entered by input?

I have a list and once I sorted it to find the "biggest value", I need to display in which position this number was entered.

Any idea how to do it ?

I made this code to receive and sort the list but I have no idea how to receive the initial position of the "data".

liste = []

while len(liste) != 5:
    liste.append (int(input("enter number :\n")))

listeSorted = sorted(liste)
print("the biggest number is : ", listeSorted[-1])

Upvotes: 3

Views: 730

Answers (2)

benjaminplanche
benjaminplanche

Reputation: 15119

Another solution with sorted() (for more generic cases e.g. if you also want the 2nd, 3rd, etc. "biggest values") :

sorted_idx_and_val = sorted(enumerate(liste), key=lambda x:x[1])
# e.g. if liste = [2, 10, 4, 6] then enumerate(liste)   = [(0, 2), (1, 10), (2, 4), (3, 6)]
#                                and sorted_idx_and_val = [(0, 2), (2, 4), (3, 6), (1, 10)]

largest_val     = sorted_ind_and_val[-1][1]
largest_val_idx = sorted_ind_and_val[-1][0]

second_largest_val     = sorted_ind_and_val[-2][1]
second_largest_val_idx = sorted_ind_and_val[-2][0]
# ...

enumerate() gives you a list containing tuples of (index, value).

The argument key of sorted() is a lambda to "preprocess" the key values to sort - here we tell sorted() to use only value (x[1]) from the (index, value) elements(x).

Upvotes: 0

Primusa
Primusa

Reputation: 13498

Instead of finding the biggest value of the list by sorting the list, use use the max function:

largest_val = max(list)

To find the first occurrence of a value in a list, use the .index method.

position = list.index(largest_val)

Upvotes: 6

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