issue with struct.unpack

[9bizy]

On Tuesday, 28 August 2012 23:49:54 UTC+1, MRAB  wrote:
> On 28/08/2012 23:34, 9bizy wrote:
> 
> > This is what I have to reproduce the challenge I am having below:
> 
> >
> 
> >
> 
> > import csv
> 
> > import struct
> 
> >
> 
> >
> 
> > data = []
> 
> >
> 
> > for Node in csv.reader(file('s_data.xls')):
> 
> 
> 
> That tries to read the file as CSV, but, judging from the extension,
> 
> it's in Excel's format. You don't even use what is read, i.e. Node.
> 
> 
> 
> >      data.append(list((file('s_data.xls'))))
> 
> >
> 
> That opens the file again and 'list' causes it to read the file as
> 
> though it were a series of lines in a text file, which, as I've said,
> 
> it looks like it isn't. The list of 'lines' is appended to the list
> 
> 'data', so that's a list of lists.
> 
> >
> 
> >      data = struct.unpack('!B4HH', data)
> 
> >      print "s_data.csv: ", data
> 
> >
> 
> > I tries so many format for the struct.unpack but I got this errors:
> 
> >
> 
> > Traceback (most recent call last):
> 
> >
> 
> >      data = struct.unpack('!B4HH', data)
> 
> > struct.error: unpack requires a string argument of length 11
> 
> >
> 
> [snip]
> 
> It's complaining because it's expecting a string argument but you're
> 
> giving it a list instead.

How do I then convert data to a string argument in this case?