am having trouble finding detailed examples.  Can you please help with 
syntax?

Am determining size when uploading a user's photo (thumbnail) to their 
profile:

    if form.process().accepted:
       session.flash = 'profile update accepted'
       file_info = cgi.FieldStorage(form.vars.thumbnail)
       form.vars.file_size = len(file_info)

the goal is to populate field file_size with number of bytes the file 
contains

but the above raises errors

thanks

Alex

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