hi,everyone. a problem with shelve Module

[softwindow]

according to the book instruduction , i use shelve Module to write
record to file.

i only write ten records like this:

               name         sex           age

                jim            male         22
                tom           male         23
                lucy           female      21

.................................................others( about ten
records)

but  i find  the size of this file .oh my god , it is about 24k

the file is too large !    is it normal ?

i don't dare to think that if i has 1000 records , it will be a very
large  file!