[Tutor] Can't figure out AttributeError message

[Reed L. O'Brien]

Jim Roush wrote:

>I'm getting the following error message:
>
>      AttributeError: 'tuple' object has no attribute 'seek'
>
>below is the code that produced the error.  The line in question is 
>marked with arrow in the left margin.  Any help would be appreciated. 
>
>def build_sp500_rand():
>    sp500_csv = open('c:/indices/sp500.csv', 'r')
>    sp500_csv_recs = sp500_csv.readlines()
>    sp500_csv.close()
>   
>    sp_rand = ('c:/indices/sp500.rnd', 'w+b')
>    record_size  = struct.calcsize('Lf')
>
>    record_number = 0
>    for rec in sp500_csv_recs:
>        rec.strip('\n')
>        sp500_csv_fields = rec.split(',')
>       
>       
>        sp500_csv_date = sp500_csv_fields[0]
>        sp500_csv_open = sp500_csv_fields[1]
>        sp500_csv_high = sp500_csv_fields[2]
>        sp500_csv_low = sp500_csv_fields[3]
>        sp500_csv_close = sp500_csv_fields[4]
>        sp500_csv_volume = sp500_csv_fields[5]
>       
>        print 'build:', sp500_csv_date
>       
>        buffer = struct.pack('Lf', long(sp500_csv_date), 
>float(sp500_csv_close))
>====>   sp_rand.seek(record_number * record_size)
>        sp_rand.write(buffer)
>       
>        record_number = record_number + 1
>       
>    sp_rand.close()
>
>
>
>
>  
>
>>> sp_rand = ('c:/indices/sp500.rnd', 'w+b')
>>> type(sp_rand)
<type 'tuple'>

you aren't opening sp_500.rnd you are assigning tuple values.

>>> sp_rand = open('c:/indices/sp500.rnd', 'w+b')
>>> type(sp_rand)
<type 'file'>

but you still need to read in values (sp_rand.readlines()) assuming
that's what you want.

~r
-- 
4.6692916090
'cmVlZG9icmllbkBnbWFpbC5jb20=\n'.decode('base64')
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