Repeat loop with problem

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I have the algorithm below, and on the line while lista[i]==lista[i-1]: is returning the error:

index out of range

import random
n1=0
n2=0
n1=int(input('Insira um numero para inicio'))
n2=int(input('Insira um numero para limite'))
i=1
lista=[]
for i in [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]:
    lista.append(random.randint(n1,n2))
i=1
count=0
print(lista[i-1])
lista.sort()
while i<=15:
    while lista[i]==lista[i-1]: 
        lista.pop(i)
        lista.insert(i,random.randint(n1,n2))
    i+=1
print(lista)
python array índices

  • Usually when you start a loop, the increasing variable always starts at 0, in the snippet lista[i-1] you’re making 0 - 1, so the result is -1 then he can’t find the index array, what you intend to do in this code?

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2 answers

4

The mistake is in while i<=15 that should be while i < 15. The list of 15 elements goes from 0 to 14, so you have to stop before you get to 15, you’re going up to 15 with the operator of "less or equal", can’t be equal, so when you get to it takes an element that doesn’t exist, the 15, and gives the error.

This code has some problems that don’t stop the execution, and it even seems to do some nonsense. And it could be more idiomatic in Python, but maybe if you take away everything that doesn’t make sense and isn’t the case.

  • That point here is also relevant to the problem!

2

Maniero’s answer is the most correct one. Just switch to while i < 15: that will no longer have this mistake.

I find it interesting that you put a condition so that n1 is less than N2, because if n1 == N2, your code will not give any error, but will enter an infinite loop, since randint will always return the same number.

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