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api.dsi.sophal.dz/hr_tickets/Python-3.9.6/Doc/includes/sqlite3/mysumaggr.py

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+import sqlite3
+
+class MySum:
+    def __init__(self):
+        self.count = 0
+
+    def step(self, value):
+        self.count += value
+
+    def finalize(self):
+        return self.count
+
+con = sqlite3.connect(":memory:")
+con.create_aggregate("mysum", 1, MySum)
+cur = con.cursor()
+cur.execute("create table test(i)")
+cur.execute("insert into test(i) values (1)")
+cur.execute("insert into test(i) values (2)")
+cur.execute("select mysum(i) from test")
+print(cur.fetchone()[0])
+
+con.close()