I have a text file as following:

1, Max Mustermann, Male, 1000.0
2, Nora Mustermann, Female, 790.0
3, Tomas Mustermann, Male, 400.0

i want to read the last value from the fourth column if i type the persons number and the number 1 to show the value. Unfortunately, I can’t get any further from here. How can i do this?

data_next = []
for data in open("my_data.txt"):
    liste = data.split(",")
    number = int(liste[0])
    name = liste[1]
    sex = liste[2]
    value = liste[3]
    data_next.append(number)
    print(f" [{number}] {name} {sex} {value}")


which_person = int(input("WHICH PERSON?: "))

if which_person in data_next:
    print("Do you want to know the value? Press 1 for YES or 2 for NO")
    next_input = int(input("YOUR INPUT: "))
    if next_input == 1:
        print(value)
    elif next_input == 2:
        print("THX")

>Solution :

You need to save the values as well in the structure, a dict is very well suited for that : number as key, values as value

data_next = {}
with open("my_data.txt") as fic:
    for data in fic:
        liste = data.split(",")
        number = int(liste[0])
        data_next[number] = liste[1:]
        print(f" [{number}] {liste[1:]}")

Then use the dict, to access the values

if which_person in data_next:
    print("Do you want to know the value? Press 1 for YES or 2 for NO")
    next_input = int(input("YOUR INPUT: "))
    if next_input == 1:
        print(data_next[which_person][2])
    elif next_input == 2:
        print("THX")

---

With regex you can handle nicely the comma+space delimiter

data_next = {}
with open("my_data.txt") as fic:
    for data in fic:
        nb, *others = re.fullmatch(r"(\d+),\s*([^,]+),\s*(\w+),\s*(\d+.?\d*)", data).groups()
        data_next[nb] = others
        print(f" [{nb}] {' '.join(others)}")
which_person = input("WHICH PERSON?: ")