ValueError: could not convert string to float: ' ' python

i have this in file

1
1
GALAXY S10
1000
MOVIL
1
1
2
2
IPHONE
1200
MOVIL
2
2
3
3
MAC
1400
ORDENADOR
2
3

my code:

listProducto1 = [1,"GALAXY S10", 1000, "MOVIL",1,1]
listProducto2 = [2,"IPHONE", 1200, "MOVIL",2,2]
listProducto3 = [3,"MAC", 1400, "ORDENADOR",2,3]

diccProductos = {1:listProducto1,2:listProducto2,3:listProducto3}
diccAuxiliar ={}

f=open(fichero,"w")
for clave in diccProductos.keys():
    f.write(str(clave)+"\n")
    for valor in diccProductos.keys():
        f.write(str(diccProductos[clave][valor-1])+"\n")
f.close()

f=open(fichero,"r")
lineas=f.read().split("\n")
contador=0

for linea in lineas:
    if (contador==0):
        varAux=str(linea)
        #varAux=linea
        #varKey = int(float(varAux))
        #varKey = int(varAux)
        print(contador,varAux)
        diccAuxiliar[varAux]=[]
    else:
        varValor=linea
        print("contador: ",contador," |valor :",varValor)
        diccAuxiliar[varAux].append(varValor)
    contador+=1

    if (contador==7):
        contador=0

print(diccAuxiliar["1"][3])

to find the key I have to use string and I want to use an integer, when I do var = int (line) it is my mistake, I tried to use float

My idea is to pass a dictionary that contains a list to a file and then take the file and make it visceverous to continue working with that dictionary without using pickle, csv, json, etc.

You code can be much cleaner if you use just a list of lists. With this approach your first product will start at 0 instead of 1 and you are going every product will have 6 lines on the output file, instead of 7, as you have in the code you posted.

Here is a solution that implements the concept I described using Python 3.6+ (because of f-strings):

from pathlib import Path

products = [
    [1, "GALAXY S10", 1000, "MOVIL", 1, 1],
    [2, "IPHONE", 1200, "MOVIL", 2, 2],
    [3, "MAC", 1400, "ORDENADOR", 2, 3]
]

filename = Path('outputfile.txt')
lines_per_product = len(products[0])

with filename.open('w') as f:
    for product in products:
        for value in product:
            f.write(f'{value}\n')

products_aux = []

with filename.open() as f:
    lines = [_.strip() for _ in f.readlines()]
    for i in range(0, len(lines), lines_per_product):
        products_aux.append([
            int(_) if _.isdigit() else _
            for _ in lines[i:i + lines_per_product]
        ])

print(products_aux[0][3])