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+### factorial
+
+Calculates the factorial of a number.
+
+Use recursion. If `num` is less than or equal to `1`, return `1`. Otherwise, return the product of `num` and the factorial of `num - 1`. Throws an exception if `num` is a negative or a floating point number.
+
+```python 
+
+def factorial(num):
+    if not ((num >= 0) & (num % 1 == 0)):
+        raise Exception(
+            f"Number( {num} ) can't be floating point or negative ")
+    return 1 if num == 0 else num * factorial(num - 1)
+
+```
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