Simple persistent "tail -f" in pure python

ptail.py

#!/usr/bin/env python

import sys, sqlite3, time, os

FILENAME = sys.argv[1]
SINCEDB_NAME = '.sincedb'

conn = sqlite3.connect(SINCEDB_NAME)
c = conn.cursor()

# Check if table exists. if not, creates it
table_check = c.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='pointers'")
if table_check.fetchone()  is None:
    print "Pointers table not found, creating."
    c.execute("CREATE TABLE pointers ('filename' TEXT NOT NULL, 'pointer' INTEGER NOT NULL)")
    conn.commit()

c.execute('SELECT pointer FROM pointers WHERE filename = ?', (FILENAME,))
ret = c.fetchone()

if ret is None:                                                                                                                                                                                                                                                                                                                              
    pointer = 0
else:
    pointer = int(ret[0])

try:
    while True:
        size = os.stat(FILENAME).st_size
        if size > pointer:
            h = open(FILENAME, 'r')
            h.seek(pointer)
            for line in h:
                print line.strip('\n')
            h.close()
            pointer = size
            c.execute('INSERT OR REPLACE INTO pointers (filename, pointer) VALUES (?, ?)', (FILENAME, pointer))
            conn.commit()
        else:
            time.sleep(1)
except KeyboardInterrupt:
    sys.exit(0)
except Exception:
    pass # non-ideal