# Sum strings in a list

Dear Python Experts,

I started learning Python one month ago and I am not sure if I am doing the right thing to sum values in a list. I have the following list with car models and I would like to sum the total vehicle available. I tried several things and I am still reading the documentation on Python.org, but I am not sure if it is the simple way to find the total car models available in a list. Please, can one give a tip? Regards

``````carros = ["ferrari", "porsche", "bugatti", "ferrari", "porsche"]

total = [  ]
lista = [  ]

for key, value in enumerate(carros):
num = int(key)
total.append(num)

for nums in total:
valores = total.count(nums)
lista.append(valores)

soma = sum(lista)
print(soma)
``````

Do you mean this?

``````carros = ["ferrari", "porsche", "bugatti", "ferrari", "porsche"]
print(len(carros))
``````

`len` (short for “length”) gives the number of items in a list.

thank you Steven

What you are naming `key`, is in fact an index into `carros`. If you `print(total)`, you’ll see the index values: `[0, 1, 2, 3, 4]` – 5 in total, one for each car.

Then in your second `for:` loop, `valores` will always be `1`, because `total.count(nums)` will only ever hold one value, so you’ll get a list that is `[1, 1, 1, 1, 1]`.

You can better what is going on with:

``````for key, value in enumerate(carros):
print(f"{key}: {carros[key]}")
``````

Or this, which will output the same:

``````for key, value in enumerate(carros):
print(f"{key}: {value}")
``````

Thank you Rob, but I think the len() solve my problem. I just want the total number of car available. Regards

You’re welcome and indeed that did provide what you needed; I was just illustrating some points that you may find of use, moving forward.