creating nested lists in python using for loop

Question

My requirements: [[R,88],[A,85],[S,78]]

My code:

n =int(input())
lst = []
for i in range(n):
    print("Enter Name " + str(i+1))
    lst.append([input()])
    for j in range(i,i+1):
        print("Enter Score " + str(j+1))
        lst.append([float(input())])
    
print(lst)

My results: [[R],[88],[A],[85],[S],[78]]

I would like to do it using for loops preferably, i know there might be easier ways to do it using list comprehensions and stuff but the fact of the matter is that I'm new to coding and I'm yet to cover those topics. Would appreciate if someone could show me how to do it using for loops.

I'm new to the space so apologies in advance if I'm not following the standard practices or playing by the rules :p

Change lst.append([float(input())]) to lst[i].append(float(input())) ? — 001
– 001, Commented May 21, 2021 at 19:05
yeah it works!! [['r', [98.0]], ['s', [82.0]]]. How do i get rid of the extra braces around the scores?? It should be like [['r',98.0],['s'.82.0]]. Thanks a lot!! — dubey
– dubey, Commented May 21, 2021 at 19:09
Note that I don't have any square brackets [ ] in my 2nd example. — 001
– 001, Commented May 21, 2021 at 19:10
Ooops sorry that was a stupid ask, thanks for your help!! You're awesome man!! — dubey
– dubey, Commented May 21, 2021 at 19:12

Udipta kumar Dass · Accepted Answer · 2021-05-21 20:31:05Z

2

The case you have asked can be simply implemented using single loop without nesting loops, Please find below code,

Note : Nested code will be required in case you will need multiple (> 2) list elements in the inner list. Let me know in comment if you need multiple elements so taht i can help with the nested loop situation

n =int(input("Enter the number of entries : "))
outer_list = []
for i in range(n):
    name = input("Enter Name " + str(i+1) + " : ")
    score = input("Enter Score " + str(i+1) + " : ")
    inner_list = [name, int(score)] # Change int to float if required
    outer_list.append(inner_list)
    
print(outer_list)

Output:

[['R', 88], ['A', 85], ['S', 78]]

edited May 21, 2021 at 20:31

answered May 21, 2021 at 20:23

Udipta kumar Dass

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Comments

Shivam Roy · Accepted Answer · 2021-05-21 19:13:32Z

1

You need to create a list inside the loop and append both the values to it, and ultimately append them to the bigger list. Also, you're appending each element as a list value, you should remove the square braces as well while taking the input, likewise:

n =int(input())
lst = []
for i in range(n):
    sub_lst = []
    print("Enter Name " + str(i+1))
    sub_lst.append(input())
    for j in range(i,i+1):
        print("Enter Score " + str(j+1))
        sub_lst.append(float(input()))
    lst.append(sub_lst)

print(lst)

Output:

[[R,88.0],[A,85.0],[S,78.0]]

edited May 21, 2021 at 19:13

answered May 21, 2021 at 19:08

Shivam Roy

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2 Comments

dubey Over a year ago

yeah it works!! someone in the comments suggested to add lst[i].append(float(input())) and that does the job too

Shivam Roy Over a year ago

ohh.. awesome !

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