Using Recursion (Python loop)

This is the question: Fill in the recursive step in this function, and then find the answer by evaluating

Hint: Remember the definition of factorials and use it to relate and In the code, you will relate factorial(n) and factorial(n-1).

This is the orginal code:

  def factorial(n):
    # Solve the base case
    if n == 0 or n == 1:
       return 1

else:
    return # How can you reduce this problem?

print(factorial(10))

I read the solution but is not said how the code should look like. I'll appreciate help :)