In Python, you can determine if a number is even or odd by using the modulo operator %. If the remainder when dividing by 2 is 0, the number is even; otherwise, it’s odd.

Code Example:

num = 7
if num % 2 == 0:
    print(f"{num} is even.")
else:
    print(f"{num} is odd.")

This code checks the remainder when num is divided by 2. If the remainder is 0, it prints that the number is even; otherwise, it prints that the number is odd.