initial build

services/checksum.py

@@ -0,0 +1,19 @@
+import random
+
+class IdChecksum:
+    @staticmethod
+    def generate():
+        while True:
+            init_num = random.randint(1, 9) 
+            id = [random.randint(0, 9) for _ in range(9)]
+            id.insert(0, init_num)
+            if IdChecksum.is_valid(id):
+                return "".join(str(x) for x in id)
+
+    @staticmethod
+    def is_valid(checksum):
+        sum_digits = sum(checksum[:-1])
+        if sum_digits % 10 == checksum[-1]:
+            return True
+        else:
+            return False