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Julian F
Asked: 2022-06-19 21:15:39 +0800 CST 2022-06-19 21:15:39 +0800 CST

Index 0 in Python and doubt with the For

  • 772

I have a logical doubt.

What I want is to display the list with its index, but not including the zero index. Using the while loop works but with the for. I am not clear why.

'''super_list = ["", 
"Opcion 1",
"Opcion 2",
"Opcion 3",
"Opcion 4",
"Opcion 6",
"Opcion 7",
"Opcion 8"]

def recorrer(cadena,posicion):
#recorrido 1
posicion=1
while posicion<len(cadena):
    print(cadena.index(cadena[posicion]),cadena[posicion])
    posicion += 1
#recorrido dos
print("Recorrido mediante el for")
for posicion in cadena:
    print(cadena.index(cadena[posicion]),cadena[posicion])
    #print(cadena.index(posicion),posicion)

'''

enter image description here

python

2 Answers

  1. Best Answer

    The correct way to traverse a list through its indices with a foris using rangeto set the limit. Since you want to start at index 1, not zero, you use range(1, len(cadena)).

    The code looks like this:

    print("Recorrido mediante el for")
for posicion in range(1, len(cadena)):
    print(posicion, cadena[posicion])
    • 1

  2. The correct way would be

    super_list = ["", 
"Opcion 1",
"Opcion 2",
"Opcion 3",
"Opcion 4",
"Opcion 6",
"Opcion 7",
"Opcion 8"]

def recorrer(cadena):
#recorrido 1
    posicion = 1
    while posicion<len(cadena):
        print(cadena.index(cadena[posicion]),cadena[posicion])
        posicion += 1
    #recorrido dos
    print("Recorrido mediante el for")
    for posicion in cadena:
        #print(cadena.index(cadena[posicion]),cadena[posicion])
        if (cadena.index(posicion) != 0):
            print(cadena.index(posicion),posicion)
       
            
        
recorrer(super_list)

    The print(string.index(string[position]),string[position]) line was giving you problems and on the other hand, to stop printing the 0, it is suggested to validate as a condition as I placed in the if.

    • 0