update factorial for python3 (hacktoberfest17#238)

factorial/Factorial.py

@@ -0,0 +1,24 @@
+'''THIS VERSION IS FOR PYTHON3'''
+result = [i for i in range(1000)]
+
+def fact_dp(n):
+    result[0] = 1
+    end = min(n, 1000) + 1
+    for i in range(1, end):
+        result[i] = i * result[i - 1]
+
+    return result[n]
+
+if __name__ == '__main__':
+
+    n = None
+
+    try:
+        n = int(input("Enter a number :"))
+    except ValueError:
+        print ("Not a number")
+
+    if (n <= 0):
+        print (1)
+    else:
+        print ("Factorial : ", fact_dp(n))