dropping tables in django database

gistfile1.py

#!/usr/bin/python

import os
import settings

fn = 'drop_tables.sql'
try:
    os.remove( fn )
except:
    pass

print 'Preparing sql commands for dropping...'

os.system( 'echo "SET FOREIGN_KEY_CHECKS=0;" >> %s' % ( fn ) ) 
for app in reversed(settings.INSTALLED_APPS):
    appname = app.split('.')[-1]
    print '\t', appname
    res = os.system( './manage.py sqlclear %s >> %s' % ( appname, fn ) ) 
os.system( 'echo "SET FOREIGN_KEY_CHECKS=1;" >> %s' % ( fn ) ) 

f = open( fn, 'r' )
c = 0 
for l in f:
    if l.find('DROP TABLE') >= 0:
        c += 1
f.close()

print c, 'tables will be dropped.'
os.system( './manage.py dbshell < drop_tables.sql' );
os.remove( fn );