These kinda things are fairly straightforward in Python

20/main.py

@@ -0,0 +1,29 @@
+import os
+import math
+import numpy as np
+
+
+def fac(n):
+	if n == 0:
+		return 1
+
+	return n * fac(n-1)
+
+def sumDigits(n):
+	s = str(n)
+	res = 0
+
+	for c in s:
+		res = res + int(c)
+
+	return res
+
+def main():
+	print("Hello, this is Patrick")
+
+	f100 = fac(100)
+	s100 = sumDigits(f100)
+	print(s100)
+
+if __name__ == "__main__":
+	main()