Help with assignment

I am having trouble with a homework assignment. The task is to "Write a function called double_it() that takes a list as a parameter. The function should iterate through the list and multiply each numeric element in the original list by 2. Assume that the list only contains numeric (int or float) values. Return of elements that were doubled". I am having trouble though and do not know why. This is the code I have so far.

Code:

def main():
    user_list = input("Enter a list of only numbers.")
    user_list_1 = [user_list]
    new_list = double_it(user_list_1)
    print(new_list)

def double_it(list_user):
    for index in range(len(list_user)):
        element = list_user[index]
        if element != " " or element != ",":
            number = int(list_user[index])
            list_user[index] *= 2
          
    return list_user
  
main()

 

You can get help from SevenMentor Python Course.

 

Here you go, As per my understanding:

def double_it(numbers):
"""Doubles the numeric elements in a list and returns a new list with the doubled values.

Args:
numbers: A list of numeric (int or float) values.

Returns:
A new list containing the doubled numeric elements from the original list.
"""

doubled_list = []
for num in numbers:
# Check if the current element is numeric (int or float)
if isinstance(num, (int, float)):
doubled_list.append(num * 2)
return doubled_list

# Example usage
my_list = [1, 2.5, "apple", 4]
doubled_numbers = double_it(my_list)
print(doubled_numbers) # Output: [2, 5.0, 8]