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If a MySQL database connection is already open from a script (say PHP), is it advisable for another script (say python) to access the same database table at the the same time?
If not, what should be the alternative?
Database systems like MySQL are designed to accommodate this kind of multi-user access. They do this by employing locking mechanisms, most of which work in the background. The locking mechanisms prevent one user from trying to read a record while someone else is writing it, or two users from writing the same record at once.
See http://dev.mysql.com/doc/refman/5.0/en/internal-locking.html