packing (struct module)

[Przemysław G. Gawroński]

I have a file with tab separated fields (posibly a different number in a
different file, but the same within the file). I would like to pack it
using some thing like this:

import struct

f = open( 'afile', 'r' )
lines = f.readlines()
packedLines = []

if len( lines ) > 0:
    formatString = '1f' * lines[ 0 ].len()

    for l in lines:
        packedLines.append( struct.pack( formatString, l ))

At this moment I would have a list of packed strings in packedLines.
The problem is in the last line of code, since I cann't pass a list to
the pack function.

I would be very thank full, for sugestions on how to do this.

Thanks Przemek