Q:

How can I convert SQLite 2 to SQLite3 using Python on Windows? 

I'm trying to convert a SQLite 2 file to SQLite3 using Python on Windows.   On Linux, I'd just pipe a dump from sqlite to sqlite3:
os.system("sqlite db.sqlite .dump | sqlite3 db3.sqlite")

On Windows, I have no such convenient means of transferring the dump.   Here's what I'm doing:
sqlite_dump = os.popen('sqlite %s .dump' % sqlite_db).read()

open(sqlite_dump_file, "w").write(sqlite_dump)

os.system("del %s" % sqlite_db)
os.system("sqlite3 -init %s %s" % (sqlite_db,
                             sqlite_dump_file))

This works, but it leaves me at a sqlite3 prompt.   I've tried the -bail switch and added `"\n.quit\n" to the end of the SQLite dump, but to no avail. 
What can I do? 

A:

Why can't you pipe it similarly on Windows?  What goes wrong when you do it?