cpython/Doc/lib/sqlite3/countcursors.py

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import sqlite3
class CountCursorsConnection(sqlite3.Connection):
def __init__(self, *args, **kwargs):
sqlite3.Connection.__init__(self, *args, **kwargs)
self.numcursors = 0
def cursor(self, *args, **kwargs):
self.numcursors += 1
return sqlite3.Connection.cursor(self, *args, **kwargs)
con = sqlite3.connect(":memory:", factory=CountCursorsConnection)
cur1 = con.cursor()
cur2 = con.cursor()
print con.numcursors