Delete item from a list in python

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Delete item from a list in python

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#1 by (2 votes)
#2 by (0 votes)

1

I do not know what I'm wrong about, I have the concept but it confuses me a bit

def eliminarEnLista(L):
   n=int(raw_input("Ingrese el numero que desea eliminar de la lista: "))       
   L=[]    
   i=0    
   while i <len(L): 
      for cont in L[i]:
          if cont <=L[i]:
              continue
          if cont==n and cont==L[i]:
              L.remove(i)
          else:
             pass
      i+=1

   return L

I do not print anything on the screen after calling this function and I would like to know what my problem is u_u

python python-2.7 python-2.x

asked by Wolf 21.10.2018 в 02:15

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2 answers

0

def eliminarEnLista(una_lista):
    posicion = input("¿Qué posición que desea eliminar de la lista: " + ",".join(una_lista) + " ? ")
    if(str(posicion).isdigit() and int(posicion) <= len(una_lista)):
        una_lista.pop(int(posicion))
        return ",".join(una_lista)
    else:
        return "Algo anda mal"

print(eliminarEnLista(["a", "b", "c", "d", "e"]))

answered by 21.10.2018 в 05:32

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score 2 · Accepted Answer

There are several things wrong with your function.

You pass a list, L, by parameter, but you assign it to an empty list, so you lose the list.

Leaving aside two nested loops, which for this problem is not necessary, in the for loop you try to traverse L [i]. Assuming that the list L is of numbers (I assume it by raw_input), L [i] will be a number, so you can not iterate over it, and in this statement the program would fail.

If you do not want to do anything if the if is breached, you do not have to do an else. Putting else to pass is completely unnecessary.

remove does not delete by index, if not by the item in the list, so you do not have to go through the list at any time.

An example of how you could do it is the following. Keep in mind that the list you pass by parameter will be modified.

def eliminarEnLista(L):
    n=int(raw_input("Ingrese el numero que desea eliminar de la lista: "))
    try:
        L.remove(n)
        print(L)
    except ValueError:
        print('{} no se encuentra en la lista'.format(n))
L = [1,2,3]
eliminarEnLista(L)