code: pyhg

ref: 5513dae7d9eee46f7e1843c8eeeaf9066d0ec632
dir: /sys/src/cmd/python/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