Inputting values into a nested dictionary using loop returning TypeError-CodePudding

I'm trying to take in the information of all the students in the school using nested dictionary. But when I try to assign the user defined value into the inner dictionary's key, it returns type error.

All the information is in a dictionary where the inner dictionary is for each "class" of the school. Here is the minimum reproducible example

#n is the number of classes in the school
n=2
school_info = {}

for j in range(1, n   1):

    school_info[j] = input("name of the class:-")

    for i in range(0, 2):

        if i == 0:
            k = "student_name :-"
        elif i == 1:
            k = "roll_number"

        school_info [j][i] = input(k)


TypeError: 'str' object does not support item assignment

But there is no string that is being assigned another value. school_info[j][i] is the inner dictionary's key for which the value is user defined.

CodePudding user response：

The result of evaluating this

school_info[j] = input("name of the class:-")

Will not allow you to later do this:

school_info [j][i] = input(k)

Because school_info[j] will be a str (the return value of calling input) and not a dict.

It seems like you want to use nested dictionaries here, so maybe what you want instead is something like this:

for j in range(1, n   1):

    answer = input("name of the class:-")
    school_info[answer] = {}

    for i in range(0, 2):

        if i == 0:
            k = "student_name :-"
        elif i == 1:
            k = "roll_number"

        school_info[answer][i] = input(k)

This is, admittedly, a guess, based on what you have and you may find other ways to achieve what you want after you have something that works.