Sequence of numbers – python

i create a program that reads a sequence of numbers, determines how many different numbers there are (we count the repetitions once), and writes the result to the standard output.
my first code:

f=int(input("String of numbers: "))
l=[]
for x in range(f):
    string_numbers = int(input(f'Enter {x+1} string of numbers: '))
    l.append(string_numbers)

mylist = list(dict.fromkeys(l))
print(len(mylist))

I wanted to take into account if the user entered a string too short or too long than declared. I wanted the user to type everything on one line. When I enter an incorrect string number, I get duplicated "incorrect string lengthincorrect string length"

f=int(input("String of numbers: "))
my_list = input('Enter numbers in the string, separated by spaces: ').split()
list_of_integers=[]
l=len(str(list_of_integers))
for i in my_list:
    list_of_integers.append((i))
mylist = list(dict.fromkeys(list_of_integers))
for i in range(f):
    if i < l:
        print("incorrect string length", end='')
    elif i > l:
        print("incorrect string length", end='')
    else:

>Solution :

It seems like you’re mixing up your different variables — f is what you want the length to be, l is just the number 2, and the way you’re comparing those two has nothing to do with the actual input entered by the user, which is my_list.

Using variable names that indicate their meaning might make it easier to keep it all straight:

num_count = int(input("Length of string of numbers: "))
num_list = input('Enter numbers in the string, separated by spaces: ').split()
if len(num_list) == num_count:
    print(f"there are {len(set(num_list))} different numbers")
else:
    print("incorrect string length")

In the above code, num_count is the count of how many (non-unique) numbers you expect them to input, and num_list is the actual list. To figure out if the list is the expected length, compare num_count to len(num_list).

Note that since all you’re doing is looking for unique values, converting the strings in num_list to int is not necessary (whether or not you use a set as I’ve done here).