hi guys i am learning python right now and i do not understand why this does not work ```py from math import floor def is_prime(n) if n = 10 and a < 100: largest_prime = find_largest_prime_number_smaller_than(a) if largest_prime is not None print("the biggest prime number smaller than", a, "is", largest_prime) else: print("could not find a prime number smaller than",a) else: print("this is not a two-digit number :( ") print("\n\n\n") input("press Enter to finish...") ``` can you help?
```py def is_prime(n) ^ SyntaxError: expected ':' ```