Even or Odd function

""" This function only tests if an integer argument
is an even number or odd """
# The function is named even_or_odd and it accepts an integer argument
def even_or_odd(number):

# The block test for oddity or eveness and it returns the appropriate string
    if number % 2 == 0:
        return "even"
    else:
        return "odd"

# Function Invokation
print(even_or_odd(2))
print(even_or_odd(0))
print(even_or_odd(13))
print(even_or_odd(9))