sorted() extending the list so i cannot find median

when I run this code it adds to the list so I can’t find the median. How would I make it so empty values do not get added to the list

import statistics
import time
amount=int(input('How many marks are you going to 
input? (most 10) '))
while amount>10:
    print('No')
    time.sleep(1)
else:
    print(amount)
    input_string=input('Enter marks of students 
separated by a space:   ')
    print('\n')
    user_list = input_string.split()
    print('list: ', user_list)
    user_list=map(int, user_list)
    print('Mean = ', sum(user_list)/amount)
    sorted_string=sorted(input_string)
    print(sorted_string)
    new=(amount+1)//2
    print(new)
    median=sorted_string[new]
    print(median)

>Solution :

First issue

You are iterating through a map more than once, which leaves you with a bug of sorting an empty collecting.
(I suggest you read more about it: map() returns an iterator)

to demonstrate the issue:

my_map = map(int, ['1', '2', '3'])

print('first run')
for i in my_map:
    print(i)

print('second run')
for i in my_map:
    print(i)

output:

first run
1
2
3
second run

Second issue

You are passing input_string to sorted() instead of user_list which is what I assume you want?

Example

Fixing (1) and (2) will result in the expected output:

import statistics
import time
amount=int(input('How many marks are you going to input? (most 10) '))
while amount>10:
    print('No')
    time.sleep(1)
else:
    print(amount)
    input_string=input('Enter marks of students separated by a space:   ')
    print('\n')
    user_list = input_string.split(' ')
    print('list: ', user_list)
    user_list=list(map(int, user_list))
    print('Mean = ', sum(user_list)/amount)
    sorted_string=sorted(user_list)
    print(sorted_string)
    new=(amount+1)//2
    print(new)
    median=sorted_string[new]
    print(median)`

dialogue:

How many marks are you going to input? (most 10) 2
2
Enter marks of students separated by a space:   100 95


list:  ['100', '95']
Mean =  97.5
[95, 100]
1
100

Side notes

Outside the context of your question, consider:

1. Taking the amount from the given list, instead of requesting for an amount explicitly
2. If the amount given is >10, then there is an infinite loop saying ‘No’. Just making sure this is intentional.