ınput-output HELP!

[bwdu]

Hi everybody!
In the code below ı M trying to write a program, that takes an integer n as command-line argument, reads
in n − 1 distinct integers between 1 and n from standard input, and writes the missing number

This is an example commend prompt(n is given 5 by user, integers are 1 3 2 5, output is 4)
$ python3 missing . py 5
1 3 2 5
<ctrl -d >
4

n = int(sys.argv[1])
i = 1
k = []
while i < n:
    a = stdio.readInt()
    i += 1
    while not stdio.isEmpty():
        k += [a]
        if a not in range(1, n):
            b = stdio.readInt()
            while not stdio.isEmpty():
                k += [b]
print(k)
    
for i in range(1, n+1):
    if i not in k:
        print(i)

Unfortunately I got this error after I entered two numbers (I gave 5 as n). Can you guuys help me?

1
2
Traceback (most recent call last):
File "C:\Users\USER\Desktop\app\missing.py", line 15, in <module>
k += [a]
MemoryError

[deanhystad]

If you have an out of range input or a duplicate input, what are you supposed to do? Print an error message? Do you keep reading inputs until you have n-1 distinct values? What do you do if you run out of inputs before you have n-1 distinct values?

The reason for your error is you made a really big list. Lets assume N is 10 and the first input is 4. You append 4 to k. 4 is in range 1, 10, so you don't read b (not the right way to handle this condition btw). The loop runs again and appends 4 to k[]. k is now [4, 4]. This continues on until k is [4,4,4,4,4,....ran out of memory]. You never read another input from stdio and because of that stdio will never be empty. You are not doing anything to empty it out.