use type() information to cast values stored as strings

Question

In my application I have generated a number of values (three columns, of type int, str and datetime, see example below) and these values are stored in a flat file as comma-separated strings. Furthermore, I store a file containing the type of the values (see below). Now, how can I use this information to cast my values from the flat file to the correct data type in Python? Is is possible or do I need to do some other stuff?

Data file:

#id,value,date
1,a,2011-09-13 15:00:00
2,b,2011-09-13 15:10:00
3,c,2011-09-13 15:20:00
4,d,2011-09-13 15:30:00

Type file:

id,<type 'int'>
value,<type 'str'>
date,<type 'datetime.datetime'>