Python please: The factorial of 1 is written 1! and equals 1. Additionally, the factorial of 5 is written 5! and equals 5 * 4 * 3 * 2 * 1 = 120. Write a program to complete the factorial() function, which returns the calculated value for a factorial. Output wording should match examples below. Any negative input values should return "is not valid, factorial defined only for non-negative integer numbers.". For example, if the input is 5 the output is factorial(5) is 120 For example, if the input is -3 the output is factorial(-3) is not valid, factorial defined only for non-negative integer numbers.

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